Internal Hex, Internal Torx, External Hex, TX, Hex
Metric, AF, Torx, Imperial, SAE
13/16 ", 5/16 ", 9 mm, 7 mm, 5/8 "
3/4, 1, 1-1/2, 2-1/2, 1/2
25.4, 12.5, 38.1, 19.05, 6.35
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphated, Gun-metal, Oxidised, Black Phosphate, Black Oxide