Wera Tools 05042755001 - 784 B 3/8" Adaptor with Quick-Release Chuck, 784 B/1 x 1/4" x 43 mm
Adaptor from square to hexagonal. Comes with a quick-release chuck for a 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.