Wera Female Square 784 B/1 Quick-Release Chuck, Adaptor 1/4" x 3/8" Drive,5042755001
Adaptor from square to hexagonal. Comes with quick-release chuck for Rapid bit Change. Suitable for the attachment of bits with ¼†hexagon drive as per DIN ISO 1173-c 6.3. Drive: 3/8†square.