Material: Chrome Vanadium Steel for Household Use Specification: Standard 1/4" Hex Shank Socket to 1/4" 3/8" 1/2" Socket & 1/4" shank can be converted to 1/4" 3/8" 1/2" square head. Suitable for screwdriver or power drill with 1/4" quick change chuck system or directly into drill chucks. Change your hand tool socket sets into impact/drive sockets. Included : 3 pieces 1/4" drive adapter, 3/8" drive adapter and 1/2" drive adapter and each with a set of 1/4" hex socket wrench adapters. Connector sockets / socket wrenches / sockets / screwdriver bits to power cordless drills.These adapters are convenient for attaching a socket set / ratchet socket / socket wrench / universal ratcheting socket wrench to a power drill.