This Wera 870/4 Socket Adaptor features a 3/8" external square drive, making it the go-to choice when working with larger 3/8" drive nut spinner sockets. The increased square drive size offers greater torque capacity, making it well suited to heavier fastening applications and a broader range of socket sizes. Driven by a 1/4" hexagonal shank (Wera connecting series 4), this adaptor connects directly to hex shank power tools and cordless drivers, giving you the versatility of a machine-operated socket tool with the convenience of a standard hex drive connection. Features and Benefits: • Adaptor for machine-operated nut spinner sockets • 1/4" hexagon drive — compatible with Wera connecting series 4 • 3/8" square drive ideal for larger sockets and heavier-duty fastening tasks • 100mm length provides excellent reach in confined spaces Specifications: Square Drive Size: 3/8" Hex Shank Drive: 1/4" Length: 100mm Contents: 870/4 Adaptor, 3/8" x 100mm