Makita B-42715 Impact Gold 3/8-Inch and 1/4-Inch Drive Socket Set, 17-Piece (Discontinued by Manufacturer) High quality steel engineered for use with impact drivers Sockets are made from heat-treated alloy steel for Xtreme torque applications Black oxide coated to resist corrosion for longer socket life High strength 6-point drive impact sockets for Xtreme torque applications Sockets are ideal for use with impact drivers, impact wrenches, and ratchets