1、Made of chrome vanadium steel, high hardness, not easy to deform, not easy to rust, long use time. 2、Adopts steel ball buckle design, which is stable and not easy to fall off. 3、Suitable for quick replacement of 1/4 4、The spring loaded ball bearing on the head securely secures the socket. 5、The 1/4in hex shank is suitable for all quick change chucks and standard drill chucks. Features: Made of chrome vanadium steel, high hardness, not easy to deform, not easy to rust, long use time. A variety of specifications and combinations. Adopts steel ball buckle design, which is stable and not easy to fall off. The spring loaded ball bearing on the head securely secures the socket. Suitable for quick replacement of 1/4" chuck system or direct access to drill chuck. The 1/4in hex shank is suitable for all quick change chucks and standard drill chucks. Suitable for screwdriver or electric screwdriver handle tool (hex or three-jaw chuck) drive socket. After use, you can convert the size of the hex head to square head. Can be used to install the socket and is a good conversion accessory.   Specification: Item Type:Socket Adapter Material:Chrome Vanadium Steel Size(Length x Diameter) 72mm x 1/2inch 65mm x 3/8inch 65mm x 1/4inch Package List: 3 x Socket Adapter