Description: High 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 storage boxes, each with a designated slot, so that the socket does not fall off easily.