Internal Hex, Internal Torx, External Hex, TX, Hex
AF, Torx, Imperial, SAE, Metric
4.5 mm, 11/16 ", 5/16 ", 7/16 ", 3/16 "
1/2, 3/8, 1, 1-1/2, 2-1/2
9.53, 19.05, 6.35, 25.4, 12.5
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphated, Gun-metal, Oxidised, Black Oxide, Black Phosphate