Wera 8784 B1 05003590001 Bit adapter Downforce 3/8 (10 mm) 44 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: £ 21.99 from Conrad Electronic