Item Type: Power Drill Socket Set_x000D_ Product Material: CR-V + Chrome_x000D_ Surface Treatment: Chrome Plating_x000D_ Shank Diameter: 1/4in Hex Handle_x000D_ Square Head: Approx. 1/4in (6.35mm), 3/8in (9.5mm), 1/2in (12.7mm)_x000D_ Length: Approx. 52mm / 2in, 55mm / 2.2in, 59mm / 2.3in 1These sockets can convert hex head drills into square head for firm and safe socket connection. 2With 1/4in, 3/8in and 1/2in square head, this power drill socket set will meet your various needs. 3Ideal for electric screwdriver and other hand?operated electric drill that has hex socket or chuck. 4Made of high quality chrome, all the adapters are not easy to deform and durable for lng use. 5Small size and light weight enable convenient carrying and storage, also very easy to install.3 x Power Drill Socket