The wera 784b 1 is a 3 8 square drive to 1 4 hex screwdriver bit holder, designed to convert a 3 8 square drive ratchet or socket wrench for use with standard 1 4 hexagon shank screwdriver bits. The adaptor features a quick-release chuck for rapid bit changes without interrupting workflow ideal for tradespeople switching between fastener types on site. The 1 4 hexagon drive conforms to din iso 1173-c 6.3, Ensuring compatibility with a wide range of standard screwdriver bits, including those from wera's connecting series 1. A ball stop groove is incorporated into the design to provide secure retention within the socket drive, reducing the risk of the adaptor working loose during use. This makes the 784b 1 a practical addition to any socket set where screwdriving capability is needed alongside conventional socket work. Features and benefits: converts 3 8 square drive to 1 4 hex for screwdriver bit use quick-release chuck for fast, efficient bit changes conforms to din iso 1173-c 6.3 For broad bit compatibility ball stop groove ensures secure retention in the socket drive compatible with wera connecting series 1 bits specifications: drive: 3 8 square bit connection: 1 4 hexagon din iso 1173-c 6.3 Length: 43mm contents: 784 b 1 x 1 4 x 43mm adaptor with quick-release chuck