External Hex, Internal Hex, Internal Torx, TX, Hex
Metric, AF, Torx, Imperial, SAE
7/8 ", 3/16 ", 3/8 ", 11/16 ", 1-1/2 "
6.35, 9.53, 19.05, 38.1, 25.4
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphated, Oxidised, Black Phosphate, Black Oxide