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