1/2-Inch Deep Impact Socket Set, 19-PieceHigh quality forging, forged from heat treated chrome vanadium steel, each socket surface treated with corrosion resistant black phosphoric acid to prevent oil and rust. Laser marking, each with a clear laser size mark, makes it quick and easy to select even in dim light. 6 point socket design expands the contact surface between the socket and the fastener, increasing the locking force, reduces wear and prevents rounding off at corners Customized