The Sealey 1/2" Drive 4 Pin Motorcycle Swingarm Lock Nut Socket with 37mm diameter (Model SMC20) is the most compact option in the range, perfectly sized for smaller motorcycles, lightweight bikes, and certain scooter applications. This smaller dimension makes it ideal for machines where space around the swingarm assembly is at a premium. The 4-tooth socket design provides precise engagement with castellated locknuts, ensuring effective removal whilst minimising the risk of fastener damage. The 1/2" square drive offers robust torque transmission despite the socket's compact dimensions, making it capable of handling even stubborn or corroded fasteners. This combination of compact sizing and professional strength makes it particularly valuable for working on restricted areas. Beyond swingarm maintenance, this 37mm socket proves useful for engine mounting nuts where castellated fasteners are employed, particularly on smaller capacity engines. Its specialist design eliminates the need for improvised solutions, ensuring safe and efficient fastener removal. Features and Benefits: • 37mm diameter for smaller motorcycle and scooter applications • 4-tooth design for secure castellated locknut engagement • 1/2" square drive for reliable torque transfer • Compact sizing ideal for restricted access areas • Suitable for engine mounting nut applications • Professional construction for workshop durability Specifications: Brand: Sealey Nett Weight: 0.140kg External Ø: 37mm Internal Ø: 28mm Internal Socket Depth: 18.5mm Number of Pins: 4 Pin Width: 7mm Pin Depth: 5mm Drive Type: 1/2"Sq