Sealey SMC21 Motorcycle Swingarm Lock Nut Socket 4-Pin 42mm 4-Tooth socket, specially designed to remove castellated lock nuts found on motorcycle swingarms. Also suitable for some engine mounting nuts. SMC21 Features 4-Tooth socket, specially designed to remove castellated lock nuts found on motorcycle swingarms Also suitable for some engine mounting nuts SMC21 Specification Model No SMC21 Brand: Sealey Nett Weight: 0.115kg External : 42mm Internal : 31.8mm (5mm depth), 26.75mm (16mm depth) Internal Socket Depth: 16mm Number of Pins: 4 Pin Width: 5mm Pin Depth: 7.5mm Drive Type: 1/2"Sq What is included: 1 x Sealey SMC21 Motorcycle Swingarm Lock Nut Socket 4-Pin 42mm