8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 21, 22, 24 mm
Comply with ANSI B107.39 B107.9 standard
Made of chrome vanadium steel, overall heat treatment hardness HRC42~45°
Mirror polished chrome-plated anti-rust and wear-resistant treatment
Used for quick disassembly and tightening of hexagon head bolts and nuts