{"title":"Engine \u0026 Transmission","description":"\u003cp\u003eEngine and transmission tools: spark plug sockets, cam belt tension gauges, diesel injection priming and flow meter kits, glow plug spanners and connector release tools.\u003c\/p\u003e","products":[{"product_id":"3-8-drive-spark-plug-sockets-6-point-from-britool-hallmark","title":"3\/8\" Drive Spark Plug Sockets 6-Point From Britool Hallmark","description":"\u003cp\u003eThese sockets are available in 16mm and 21mm sizes, with approximate lengths of 62mm and 65mm. An integrated rubber insert holds the spark plug securely in place during installation and removal. They can be operated using either a standard 3\/8-inch drive ratchet or a spanner.\u003c\/p\u003e\u003cp\u003eEach socket features a high polished chrome finish and is stamped with the modern Marque of Skill branding. Originally developed in the 1980s for the automotive aftermarket, the Hallmark range is covered by a guarantee against defects in materials and workmanship. This guarantee excludes normal wear and tear or moving components.\u003c\/p\u003e","brand":"Britool Hallmark","offers":[{"title":"16mm","offer_id":57072629547334,"sku":"MSP16","price":12.15,"currency_code":"GBP","in_stock":true},{"title":"21mm","offer_id":57072629580102,"sku":"MSP21","price":13.25,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1012\/7104\/4422\/files\/msp16.jpg?v=1785945022"},{"product_id":"3-8sd-hexagon-af-imperial-spark-plug-sockets-from-britool","title":"3\/8\"Sd Hexagon Af \/ Imperial Spark Plug Sockets From Britool","description":"\u003cp\u003eEngineered specifically for spark plug removal and installation, these sockets feature a 3\/8-inch square drive fitting. The 6-point hexagon profile provides secure engagement on standard spark plug hexes, reducing the risk of rounding off fasteners during service work.\u003c\/p\u003e\u003cp\u003eThe range covers two standard Imperial AF sizing options: 5\/8-inch and 13\/16-inch. Each socket is supplied with a polished chrome surface finish for clean, reliable use across engine maintenance tasks.\u003c\/p\u003e\u003cp\u003eOptions include individual socket selection or a twin pack containing both AF sizes. This enables technicians and mechanics to select the exact tooling configuration needed for specific engine applications.\u003c\/p\u003e","brand":"Britool Hallmark","offers":[{"title":"5\/8\" AF","offer_id":57072635543878,"sku":"ADH625","price":8.99,"currency_code":"GBP","in_stock":true},{"title":"13\/16\" AF","offer_id":57072635576646,"sku":"ADH812","price":8.99,"currency_code":"GBP","in_stock":true},{"title":"Twin Pack","offer_id":57072635609414,"sku":"ADH625+812","price":12.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1012\/7104\/4422\/files\/adh625.jpg?v=1785945097"},{"product_id":"magnetic-spark-plug-sockets-3-8-drive-6-point-profile-from-britool-hallmark","title":"Magnetic Spark Plug Sockets, 3\/8\" Drive, 6-Point Profile From Britool Hallmark","description":"\u003cp\u003eThis 3\/8-inch drive spark plug socket incorporates an internal magnetic insert that grips the plug ceramic during removal and installation. The 6-point hexagonal profile prevents head damage on 16mm and 21mm spark plug bodies.\u003c\/p\u003e\u003cp\u003eThe 16mm socket measures approximately 62mm long and can be driven via a 3\/8-inch ratchet or a 19mm spanner. The 21mm variant measures roughly 65mm long and accepts a 3\/8-inch drive or a 22mm spanner on its external hex.\u003c\/p\u003e\u003cp\u003eFinished in high-polished chrome and stamped with the Marque of Skill hallmark. Part of the Britool Hallmark range, covered by warranty against defective materials and workmanship under standard workshop usage.\u003c\/p\u003e","brand":"Britool Hallmark","offers":[{"title":"16mm","offer_id":57072640131398,"sku":"MMSP16","price":12.99,"currency_code":"GBP","in_stock":true},{"title":"21mm","offer_id":57072640164166,"sku":"MMSP21","price":13.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1012\/7104\/4422\/files\/MMSP16.jpg?v=1785945101"},{"product_id":"britool-england-3-8-drive-af-13-16-spark-plug-socket","title":"Britool England 3\/8\" Drive Af 13\/16\" Spark Plug Socket","description":"\u003cp\u003eThis specialised spark plug socket features a 3\/8-inch square drive for connection to standard ratchets, torque wrenches, and extension bars. It is sized in Imperial AF measurements at 13\/16 inches for dedicated spark plug removal and installation.\u003c\/p\u003e\u003cp\u003eThe socket utilises a 6-point profile that contacts the flat sides of the hex rather than the corners. This design minimises the risk of rounding off delicate spark plug bodies during high-torque removal or final tightening.\u003c\/p\u003e\u003cp\u003eBuilt for automotive maintenance and engine overhaul tasks, this socket provides a precise fit on compatible 13\/16-inch AF plugs, giving mechanics reliable engagement inside recessed cylinder head wells.\u003c\/p\u003e","brand":"Britool Hallmark","offers":[{"title":"Default Title","offer_id":57072641835334,"sku":"MHS812 -","price":11.44,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1012\/7104\/4422\/files\/mhs812_2.jpg?v=1785945143"},{"product_id":"britool-england-3-8-drive-af-5-8-flexible-spark-plug-socket-length-83-5mm","title":"Britool England 3\/8\" Drive Af 5\/8\" Flexible Spark Plug Socket, Length 83.5mm","description":"\u003cp\u003eThis 3\/8-inch drive spark plug socket measures 83.5mm in total length and features a 5\/8-inch profile. Designed specifically for spark plug removal and installation, it incorporates an integrated universal joint directly above the socket head.\u003c\/p\u003e\u003cp\u003eThe built-in flexible joint allows the socket to pivot, granting clear alignment when working in tight or angled engine bay spaces. Its 6-point internal wall profile grips hex spark plug bodies across the flat sides to minimise fastener damage during torque application.\u003c\/p\u003e\u003cp\u003eThe top end connects directly to standard 3\/8-inch square drive ratchets, extension bars, and torque wrenches for straightforward integration into existing tool kits.\u003c\/p\u003e","brand":"Britool Hallmark","offers":[{"title":"Default Title","offer_id":57072645865798,"sku":"MFHS625 -","price":10.45,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1012\/7104\/4422\/files\/MFHS625.jpg?v=1785945157"},{"product_id":"britool-england-3-8-drive-af-5-8-spark-plug-socket","title":"Britool England 3\/8\" Drive Af 5\/8\" Spark Plug Socket","description":"\u003cp\u003eThis 3\/8-inch square drive spark plug socket features a 5\/8-inch AF size and a 6-point hex profile. It is designed specifically for removing and installing standard 5\/8-inch Imperial spark plugs in automotive and machinery engines.\u003c\/p\u003e\u003cp\u003eAn internal rubber insert retains the spark plug securely inside the socket during removal and insertion, helping to prevent damage to the ceramic insulator. The 6-point internal profile grips the hexagon of the plug to apply turning force without slippage.\u003c\/p\u003e\u003cp\u003eSuitable for professional mechanics, vehicle technicians, and motor enthusiasts using standard 3\/8-inch ratchets, extensions, and torque tools.\u003c\/p\u003e","brand":"Britool Hallmark","offers":[{"title":"Default Title","offer_id":57072646226246,"sku":"MHS625","price":9.7,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1012\/7104\/4422\/files\/mhs625_2.jpg?v=1785945158"},{"product_id":"cam-belt-tesion-gauge-britool-hallmark-hmubtg","title":"Cam Belt Tesion Gauge Britool Hallmark Hmubtg","description":"\u003cp\u003eThe tool measures cam belt movement by load in Newton Metres (Nm). It features clear incremental markings and a dual scale that allows the user to read measurements from either the top or the bottom of the tool. Precise adjustment is managed via a knurled knob.\u003c\/p\u003e\u003cp\u003eThis gauge is suitable for a broad range of automotive timing belt applications where specific tensioning figures must be met for correct engine timing and belt longevity.\u003c\/p\u003e","brand":"Britool Hallmark","offers":[{"title":"Default Title","offer_id":57072663331142,"sku":"HMUBTG","price":26.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1012\/7104\/4422\/files\/hmubtg.jpg?v=1785945289"},{"product_id":"flow-meter-common-rail-adapter-set-48-pieces-from-britool-hallmark","title":"Flow Meter Common Rail Adapter Set, 48 Pieces, From Britool Hallmark","description":"\u003cp\u003eThe kit includes 32 specific injector adapters compatible with Bosch, Siemens, Denso, and Delphi systems. It is designed to work with common rail testing kits, including the Britool Hallmark HMCRS set.\u003c\/p\u003e\u003cp\u003eAll components are supplied in a plastic storage case for organisation. These tools are unbranded and form part of the Britool Hallmark range for diesel fuel system diagnostics.\u003c\/p\u003e","brand":"Britool Hallmark","offers":[{"title":"Default Title","offer_id":57072663363910,"sku":"HMCRAS48","price":99.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1012\/7104\/4422\/files\/hmcras48_tattt175g.jpg?v=1785945289"},{"product_id":"diesel-injection-system-priming-tool-from-britool-hallmark","title":"Diesel Injection System Priming Tool From Britool Hallmark","description":"\u003cp\u003eThe tool is required whenever the fuel system has been disturbed to ensure the pump is correctly primed before starting. It measures 330mm in total length.\u003c\/p\u003e\u003cp\u003eThis priming tool is an unbranded component of the Britool Hallmark range. It is a specific maintenance tool for technicians working on diesel injection systems.\u003c\/p\u003e","brand":"Britool Hallmark","offers":[{"title":"Default Title","offer_id":57072663462214,"sku":"HMDPP - PROM1654","price":19.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1012\/7104\/4422\/files\/britool-hallmark-diesel-injection-system-priming-tool---hmdpp1-1_2.jpg?v=1785945289"},{"product_id":"flow-meter-common-rail-set-from-britool-hallmark-hmcrs","title":"Flow Meter Common Rail Set From Britool Hallmark Hmcrs","description":"\u003cp\u003eThe kit enables direct measurement of injector return flow using an external flow metre. This process helps identify faulty or imbalanced injectors in diesel engines.\u003c\/p\u003e\u003cp\u003eThe set is supplied in a dedicated box for storage and transportation. These tools are unbranded and are part of the Britool Hallmark range for professional diesel system troubleshooting.\u003c\/p\u003e","brand":"Britool Hallmark","offers":[{"title":"Default Title","offer_id":57072663626054,"sku":"HMCRS","price":39.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1012\/7104\/4422\/files\/hmcrs_tattt205.jpg?v=1785945291"},{"product_id":"britool-ratcheting-offset-glow-plug-spanner-range","title":"Britool Ratcheting Offset Glow Plug Spanner Range","description":"\u003cp\u003eThese reversible ratcheting spanners are specifically intended for the installation and removal of glow plug units and bus bars. The offset design allows for better clearance and handling in the confined spaces typical of engine maintenance.\u003c\/p\u003e\u003cp\u003eThe range includes various sizes and configurations to suit specific vehicle requirements, including a twin pack option. These tools are designed for professional automotive technicians who require precise control during glow plug servicing.\u003c\/p\u003e","brand":"Britool Hallmark","offers":[{"title":"8mm","offer_id":57072678273350,"sku":"GPW2","price":8.99,"currency_code":"GBP","in_stock":true},{"title":"12mm","offer_id":57072678306118,"sku":"GPW1","price":9.99,"currency_code":"GBP","in_stock":true},{"title":"8 x 12mm","offer_id":57072678338886,"sku":"GPW3","price":12.0,"currency_code":"GBP","in_stock":true},{"title":"8mm + 12mm Twin Pack","offer_id":57072678371654,"sku":"GPW1+GPW2","price":15.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1012\/7104\/4422\/files\/gpw1_1.jpg?v=1785945406"},{"product_id":"extra-long-spark-plug-socket-21mm-12-point-3-8-drive-britool-hallmark","title":"Extra Long Spark Plug Socket 21mm (12-Point) 3\/8\" Drive Britool Hallmark","description":"\u003cp\u003eThe tool measures 250mm in length, providing clearance in deep engine bays. Its thin-wall construction allows for access in restricted spaces where standard sockets may be too wide. A magnetic end is integrated into the socket to assist in the safe retrieval and installation of spark plugs.\u003c\/p\u003e\u003cp\u003eManufactured from Chrome Vanadium steel, the socket includes a knurled section at the drive end to facilitate hand-turning with oily or greasy fingers. This item is part of the Britool Hallmark range but does not carry branding on the tool itself.\u003c\/p\u003e","brand":"Britool Hallmark","offers":[{"title":"Default Title","offer_id":57072681320774,"sku":"HMSPXL21","price":19.5,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1012\/7104\/4422\/files\/hmspxl16.jpg?v=1785945460"},{"product_id":"extra-long-spark-plug-socket-16mm-12-point-3-8-drive-britool-hallmark","title":"Extra Long Spark Plug Socket 16mm (12-Point) 3\/8\" Drive  Britool Hallmark","description":"\u003cp\u003eThis socket is manufactured from Chrome Vanadium steel and features a thin-wall design to allow access into narrow spark plug ports. The 250mm length provides reach for deep-seated plugs, while the integrated magnetic end ensures safe retrieval and installation.\u003c\/p\u003e\u003cp\u003eThe exterior includes a knurled section at the drive end, allowing for manual rotation even when hands are greasy. Although part of the Britool Hallmark range, this specific socket is unbranded.\u003c\/p\u003e","brand":"Britool Hallmark","offers":[{"title":"Default Title","offer_id":57072684564806,"sku":"HMSPXL16","price":15.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1012\/7104\/4422\/files\/britool-hallmark-3-8--extra-long-14mm-bi-hexagon-spark-plug-socket---hmspxl14-1.jpg?v=1785945474"},{"product_id":"3-8-drive-spark-plug-socket-from-britool-hallmark","title":"3\/8\" Drive Spark Plug Socket From Britool Hallmark","description":"\u003cp\u003eThe set is manufactured from Chrome Vanadium steel for strength and durability. It contains four sockets in common sizes: 16mm, 21mm, 5\/8 inch, and 13\/16 inch. These sizes cover a wide range of standard automotive and small engine spark plugs.\u003c\/p\u003e\u003cp\u003eThese 3\/8 inch drive sockets are designed for use with manual ratchets and extension bars. The set provides the essential sizes required for routine engine maintenance and spark plug replacement.\u003c\/p\u003e","brand":"Britool Hallmark","offers":[{"title":"Default Title","offer_id":57072798761286,"sku":"SPSET4NM","price":9.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1012\/7104\/4422\/files\/SPSET4transparent.jpg?v=1785945518"},{"product_id":"britool-ratcheting-offset-glow-plug-spanner-8-x-12mm","title":"Britool Ratcheting Offset Glow Plug Spanner 8 X 12mm","description":"\u003cp\u003eThis 8 x 12mm automotive spanner incorporates a reversible ratcheting mechanism engineered for diesel engine service. It is designed specifically for installing and removing glow plug units along with glow plug bus bars.\u003c\/p\u003e\u003cp\u003eThe offset physical profile improves tool clearance around surrounding engine bay components, enabling precise handling during intricate fitting tasks. Reversible operation allows rapid directional changes without removing the tool from the fastener head.\u003c\/p\u003e\u003cp\u003eSuitable for automotive technicians and mechanics, this metric spanner simplifies routine glow plug replacement procedures while working in restricted workshop environments.\u003c\/p\u003e","brand":"Britool Hallmark","offers":[{"title":"8 x 12mm","offer_id":57072805282118,"sku":"GPW3 - PROM2031","price":6.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1012\/7104\/4422\/files\/GPW3PNGLARGE_9b916b25-32b8-41b7-b415-6225c041b9d4.png?v=1785945532"},{"product_id":"extra-long-spark-plug-socket-14mm-12-point-3-8-drive-britool-hallmark","title":"Extra Long Spark Plug Socket 14mm (12-Point) 3\/8\" Drive  Britool Hallmark","description":"\u003cp\u003eThis 14mm spark plug socket features a 3\/8-inch square drive and an extended 250mm overall length, providing the reach required for deep spark plug wells in modern motor vehicle and motorcycle cylinder heads.\u003c\/p\u003e\u003cp\u003eIt incorporates a bi-hexagon (12-point) profile and an internal magnetic retention system. The magnet grips the spark plug securely during both extraction and installation, preventing dropped components and reducing cross-threading risks during fitting.\u003c\/p\u003e","brand":"Britool Hallmark","offers":[{"title":"Default Title","offer_id":57073005330758,"sku":"HMSPXL14","price":14.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1012\/7104\/4422\/files\/britool-hallmark-3-8--extra-long-14mm-bi-hexagon-spark-plug-socket---hmspxl14-1_5812fc5e-27d3-4241-b9ce-3b51ec1bf9cb.jpg?v=1785945767"}],"url":"https:\/\/britoolhallmark.com\/collections\/automotive-tools-engine-and-transmission.oembed","provider":"Britool Hallmark","version":"1.0","type":"link"}