• Square coupler for clockwise/anti-clockwise operation • Sturdy mechanisms • Acc. to DIN 3122, ISO 3315 • Dual-material handle, for easy handling • Matt chrome-plated surface • Also suitable for use with stepped keys and radiator nipple keys • For sockets, accessories etc. with square drive as per DIN 3120 - C 12.5, ISO 1174, with ball retention groove • Chrome-vanadium steel