▲Product Description Complete rust and corrosion resistance with fully polished, Chrome plated mirror finish bits treatment.Heat-treated S2 alloy steel bits, Reduce wear-outs.Hardened treated Chrome Vanadium steel, Increase turning power. The results of tests show that the maximum torsion force of bits are 180-200N and the hardness of bits are 60±2HRC. The high torsion and proper hardness avoid the bits break and wear. ▲Metric and SAE S2 Steel Hex Bits Set 15 Pack Metric hex bits, Sizes - 1.5mm, 2.0mm, 2.5mm, 2.5mm, 3.0mm, 3.0mm, 3.5mm, 3.5mm, 4.0mm, 4.0mm, 5.0mm, 5.0mm, 6.0mm, 7.0mm, 8.0mm. 15 Pack SAE hex bits, Sizes - 1/16", 5/64", 3/32", 3/32", 7/64", 1/8", 9/64", 5/32", 5/32", 11/64", 3/16", 13/64", 7/32", 15/64", 1/4".