Internal Torx, Internal Hex, External Hex, Hex, TX
Metric, AF, Imperial, Torx, SAE
5/16 ", 5/8 ", 11/16 ", 9 mm, 25 mm
1/4, 1-1/2, 1, 2-1/2, 3/8
6.35, 12.5, 38.1, 25.4, 19.05
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphated, Oxidised, Black Oxide, Black Phosphate