Features Drive Adapter: All parts are equipped with spring loaded stop bearing balls that lock onto the sleeve to ensure a secure fit with the drive head and prevent slippage and looseness. Can be used with electric drill or impact driver to greatly simplify your work and operation. Total of 3 Pieces: There are 3 pieces of socket adapters in 1/2", 3/8" and 1/4" diameters to meet your home, mechanical or automotive maintenance needs. Secure Fixing:Designed for universal 1/4 inch hexagonal rod and spring ball, with extended bits for quick and firm locking. Lightweight, small size and easy to install in minutes. High Quality Materials: Made of high quality chrome vanadium steel material, plated with protective coating for strength and durability. The drill is compatible with common heavy duty power tools, drivers and screwdriver handle tools. Widely Used: Suitable for automotive machinery vehicle maintenance, technicians, mechanics and hobbyists to develop, can be used at home, workshop factory or construction site with hardware/tire nuts, tension bolts, sockets on hex head cap screws. Specification: Item Type: Socket Adapter Material: Chrome Vanadium Steel Shank Diameter: 1/4in Head Diameter: 1/2in, 3/8in, 1/4in. Package List: 3 x Socket Adapter Note: Fit to size before use. Package List 3 x Socket Adapter