1/4", 3/8" and 1/2" Impact power bit socket adapter 2" long with 1/4" hex shank. High-strength chrome vanadium steel construction for durability and strength. Spring-loaded detent ball and chamfered ends provide a secure fit into sockets when using high-torque impact-rated drivers. Black phosphate finishes to reduce corrosion and rust. For all cordless, electric, and pneumatic impact wrenches, drivers, and drills.