General description This 1/2" square 21mm Impact Socket is 80mm long and includes a retaining pin and O-ring. It is designed for use with impact wrenches and is particularly useful for scaffolders working at height, as well as for racking automotive highways maintenance. Technical specifications Drive size: 1/2" Socket size: 21mm Length: 80mm Compatibility and accessories Includes a steel retaining pin to lock the socket onto the square drive of the impact wrench Rubber O-ring to hold the pin in place Usage Ideal for scaffolders when working at height Suitable for automotive highways maintenance Other information High strength with a black oxide coating for prolonged life Robust socket specifically designed for impact wrenches