Internal Torx, Internal Hex, External Hex, TX, Hex
AF, Metric, Imperial, Torx, SAE
3/16 ", 5.5 mm, 5/16 ", 7/16 ", 23 mm
3/4, 1-1/2, 2-1/2, 3/8, 1/4
25.4, 9.53, 19.05, 6.35, 38.1
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphatized, Oxidised, Black Oxide, Black Phosphate