SWANLAKE 3/8" Drive Impact Socket Set, 50-Piece Standard SAE 5/16 to 3/4 inch and Metric 8-22mm Size, 6 Point, Cr-V, 3/8-Inch Ratchet Handle, Extension Bar, Universal JointHigh 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. Customized storage boxes, each with a designated slot, so that the socket does not fall off easily. Sizes are also printed next to each card slot for easy identification. 6 point