Works with 1/4" quick-change chuck system or inserts a chuck directly/converts any electric/cordless drill into a handheld/electric nut driver for driving nuts, bolts and screws screw fixings etc. Holds the socket firmly. [Included] 3 piece 1/4 3/8/1/2" extension set and 4 1/4 to 3/8 output adapters - 3/8 1/4" - 3/8 to 1/2 - 1/2 to 3/8. Whatever tool you choose to use, it offers versatility and convenience .Ideal for DIY, home maintenance and most general repairs, not industrial work.A great addition to any toolbox. 1/4 - 1 Adapter Set /2" 4 (connectors) Suitable for all types of ratchets, ratchets, sockets, torque wrenches, grips, etc. Passivated design: Passivated end facilitates quick installation and removal. material, strong and durable, suitable for electric drill, pneumatic drill, electric wrench, manual wrench, pneumatic screwdriver, electric screwdriver, etc. Hexagonal steel connecting rod, chrome vanadium alloy steel, chrome plated, beautiful appearance, high hardness, strong and durable. Safety: Square with anti-break steel ball, the connection is tight and not easy to fall off, and the security is not firm. Material: 45# steel, chrome plated Material: CRV chrome vanadium alloy steel, chrome plated Appearance: Inner square transforms outer square (1/4"->3/8", 3/8" ->1/4", 3/8" ->1/2", 1/2"- >3/8")