Wera Zyklop Bit Adapter 1/4″ Square to 1/4″ Hex with Quick-release Chuck (Length 1-1/2″ (37mm))
Connector from square head to hexagonal
For 1/4″ hexagon bits as per DIN ISO 1173-C 6.3 and E 6.3 and Wera connection series 1 and 4
With quick-release chuck