Sealey Quick Release Bit Adaptor - 10mm 1/2"Sq Drive. This quick release adaptor is made from Chrome Vanadium steel and is suitable for use with 10mm hex drive bits. Insert bits firmly into the holder to lock them in position, and simply push the sleeve forward to release. It comes with a lifetime guarantee. Model No. AK2739. Weight: 0.11kg. Drive: 1/2"Sq(F) x 10mm Hex(F). Nett Weight: 0.10kg.