Internal Hex, Internal Torx, External Hex, TX, Hex
Metric, Torx, AF, Imperial, SAE
7/16 ", 13/16 ", 7/8 ", 12 mm, 1-1/2 "
1/4, 3/4, 2-1/2, 1-1/2, 1/2
19.05, 12.5, 25.4, 38.1, 9.53
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphated, Gun-metal, Oxidised, Black Oxide, Black Phosphate