Premium material: 3 pieces, 45# steel hexagonal connecting rods, chrome-plated, rust-resistant, high hardness, wear-resistant, strong and durable. Wide range Applications: 1/4 square head hex connecting rod (1/4", 3/8", 1/2"), suitable for electric drills, pneumatic drills, electric wrenches, hand wrenches, pneumatic screwdrivers, electric screwdrivers. , etc. Steel ball anti-breakage design: the steel ball makes the connector and adapter not easy to fall off during use, safe and firm, and the tight connection can reduce wear of screws.Passivated design: Passivated ends allow for quick installation and easy disassembly. 3-Piece Chrome Vanadium Steel Adapter Kit with Ball Bearing Lock Head balls to turn any electric drill into an electric nut driver; display packaged. Chrome vanadium steel for heavy-duty impact motors. < p> Spring-loaded ball bearings on the head sit securely on the socket. For 1/4" chuck system quick-change or directly into the drill This set is perfect for your hammer drill or drill and allows you to Replace the ratchet with a power tool. 1/4" hex shank fits all quick-change collets as well as to standard collets Chuck: 1/4": 66mm long 3/8": 64mm long 1/2": 72mm long Allows you to mix and match drive sizes for your sockets, ratchets Handles, extensions and other accessories. < p> Package included: 1 socket adapter (1/4" hex to 1/4" socket) < p> 1 socket adapter (1/4" hex shank to 3/8" socket) 1 socket adapter (1/4" hexagon socket) 4" to 1/2" socket Delivered quantity: 3 pieces Product color: silver Product size: 66 mm, 64 mm, 72mm Note: Manual measurement, please allow 1-3cm error.