The Wera universal 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.

Universal holder for the take-up of bits with 1/4" hexagon head drive
The retaining ring ensures a secure fit of the tool in the holder
1/4" hexagon drive (Wera connecting series 1)

Suitable for 1/4" DIN ISO 1173-C 6,3 hexagon insert bits and Wera Series 1 Design With retaining ring Drive 1/4" hexagon, suitable for power tools with DIN ISO 1173-F 6,3 receiver