Internal Hex, Internal Torx, External Hex, TX, Hex
Torx, Metric, AF, Imperial, SAE
5/16 ", 7/16 ", 11/16 ", 26 mm, 34 mm
1-1/2, 3/4, 1, 2-1/2, 1/2
38.1, 9.53, 19.05, 6.35, 25.4
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphatized, Oxidised, Black Oxide, Black Phosphate