Check the listing for details. 6 Points Deep Socket 1/2" Drive 21mm Nickel Plating Hex Socket 3.1" Long. Condition: New. Listed at 18.62 USD. Our hex sockets are made of chrome-vanadium steel, which is hardened at high temperatures for high hardness, toughness, and wear resistance. They can withstand the high torque generated by high-pressure impact tools without wearing out. Polished nickel-plated for waterproof corrosion and rust resistance, they are suitable for various working environments.The grooved hexagonal design facilitates tightening of nuts and bolts, ensuring a secure grip and preventing slippage or deformation, even under high torque applications. The socket can reach into tight spaces, ensuring a tight connection between the nut and engine bolt..Hexagonal deep sockets can be used with a variety of commercially available power wrenches, ratchets, and benders.