Internal Torx, Internal Hex, External Hex, Hex, TX
Metric, Imperial, AF, Torx, SAE
5/16 ", 7/32 ", 12 mm, 3/16 ", 7/16 "
3/4, 1, 2-1/2, 1-1/2, 3/8
19.05, 6.35, 12.5, 25.4, 9.53
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphated, Gun-metal, Oxidised, Black Phosphate, Black Oxide