Internal Hex, Internal Torx, External Hex, TX, Hex
AF, Imperial, Torx, SAE, Metric
5/16 ", 9/32 ", 3/16 ", 3/4 ", 11/16 "
3/8, 1-1/2, 3/4, 2-1/2, 1
19.05, 6.35, 25.4, 9.53, 38.1
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphated, Oxidised, Black Phosphate, Black Oxide