A high quality set of Whitworth 12-point sockets by Koken (Japan). 3/8″ drive. Includes a socket holder. A set of Whitworth tools for your old british motorcycle or car is necessary, due to BSW or British Standard Whitworth hardware. Your standard or metric tools will never fit right and will round out your bolt heads. This set of 8 12-point sockets includes 1/8 WW, 3/16″ WW, 1/4″ WW, 5/16″ WW, 3/8″ WW, 7/16″ WW, 1/2″ WW, and 9/16″ WW sockets.