Internal Hex, Internal Torx, External Hex, TX, Hex
Imperial, Torx, Metric, AF, SAE
5/16 ", 5/8 ", 3/16 ", 5.5 mm, 11/16 "
1, 1-1/2, 2-1/2, 1/2, 3/4
38.1, 19.05, 9.53, 6.35, 25.4
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphated, Gun-metal, Oxidised, Black Oxide, Black Phosphate