890/4/1 Universal Bit Holder, 1/4", x 57 mmUniversal holder for the take-up of bits with hexagon head drive as per DIN ISO 1173-C 6.3. The retaining ring ensures an optimum fit of the tool in the holder. hexagonal, suitable for power screwdrivers with take-up as per DIN ISO 1173-F 6.3.