Internal Torx, Internal Hex, External Hex, TX, Hex
AF, Metric, Torx, Imperial, SAE
7/16 ", 11/16 ", 5/16 ", 3/16 ", 30 mm
3/8, 1/4, 2-1/2, 3/4, 1/2
38.1, 12.5, 19.05, 6.35, 9.53
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphatized, Oxidised, Black Phosphate, Black Oxide