Stahlwille 31150001 3115 Adaptor A 6,3 manually operated For torque screwdrivers No 760 and No 775, for manually operated sockets with recessed 6.3 (1/4) square drive DIN 3120/ISO 1174-1 Type C and D, square drive with ball bearing, Chrome Alloy Steel, gunmetal finish. Features: Outside Square: A 6