External Hex, Internal Hex, Internal Torx, TX, Hex
AF, Imperial, Torx, SAE, Metric
5/8 ", 7/8 ", 5 mm, 3/4 ", 1-1/2 "
3/4, 1/4, 2-1/2, 1/2, 3/8
38.1, 25.4, 19.05, 6.35, 9.53
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphated, Gun-metal, Oxidised, Black Phosphate, Black Oxide