Internal Hex, Internal Torx, External Hex, TX, Hex
Imperial, AF, Torx, SAE, Metric
5/16 ", 3/4 ", 3/16 ", 9/16 ", 11/16 "
1-1/2, 3/4, 1/4, 2-1/2, 1/2
19.05, 38.1, 12.5, 6.35, 25.4
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphated, Gun-metal, Oxidised, Black Oxide, Black Phosphate