Internal Torx, Internal Hex, External Hex, TX, Hex
Imperial, AF, Metric, Torx, SAE
7/16 ", 6 mm, 5/16 ", 5/8 ", 12 mm
1, 1-1/2, 2-1/2, 1/2, 3/4
12.5, 38.1, 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