Wera 05053522001 894/4/1 1/4'' Hex K Universal Quick-Release Bit Holder is for the take-up of bits with " hexagon head drive as per DIN ISO 1173-C 6.3 and has quick-release chuck for rapid bit change. Wera 894/4/1 1/4'' Hex K Universal Quick-Release Bit Holder is suitable for power screwdrivers with take-up as per DIN ISO 1173-F 6.3.