Internal Hex, Internal Torx, External Hex, TX, Hex
Metric, AF, Torx, Imperial, SAE
9/16 ", 6 mm, 5/16 ", 11/16 ", 1-1/2 "
3/4, 1, 1-1/2, 2-1/2, 1/2
25.4, 19.05, 9.53, 6.35, 12.5
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphated, Gun-metal, Oxidised, Black Oxide, Black Phosphate