Internal Hex, Internal Torx, External Hex, TX, Hex
AF, Imperial, Torx, SAE, Metric
7/16 ", 7/8 ", 5.5 mm, 9 mm, 11/16 "
1-1/2, 3/4, 1, 2-1/2, 1/2
12.5, 6.35, 19.05, 25.4, 9.53
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphated, Oxidised, Black Phosphate, Black Oxide