External Hex, Internal Hex, Internal Torx, TX, Hex
AF, Torx, Metric, Imperial, SAE
5/16 ", 3/16 ", 5/8 ", 28 mm, 1-1/2 "
3/4, 1-1/2, 1/2, 2-1/2, 1
25.4, 9.53, 6.35, 19.05, 38.1
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphatized, Oxidised, Black Phosphate, Black Oxide