Product Description Adapter with square and hex drives for use with sockets with square drive and hexagon bits. Features:with quick-change chuck for fast bit changeschrome vanadiumModels:1/4" Drive:square 1/4" (6.3 mm)Drive: hex 1/4" (6.3 mm) Total Length: 37 mm Compatibility: made for 1/4" hex bits as per DIN ISO 1173-C 6.3 and E 6.3 and Wera connecting series 1 and 4 Manufacturer Number: 8784 A1 3/8" Drive: square 3/8" (10 mm) Drive: hex 1/4" (6.3 mm) Total Length: 44 mm Compatibility: made for 1/4" hex bits as per DIN ISO 1173-C 6.3 and E 6.3 and Wera connecting series 1 and 4 Manufacturer Number: 8784 B1 Contents:1 x Wera Zyklop 8784 bit adaptor Manufacturer: Wera Werkzeuge GmbH Korzerter Straße 21-25 42349 Wuppertal Germany info@wera.de