Wera 8784 C2 05003641001 Bit adapter Downforce 1/2 (12.5 mm) 50 mm 1 pc(s)

Connection part from square to hexagonal. For 1/4" hex bits to DIN 3126-C 6.3 and E 6.3, ISO 1173 and Wera connection items 1 and 4. With quick change fodder.

Price: £ 37.99 from Conrad Electronic