Internal Hex, External Torx, External Hex, TX, Hex
AF, Imperial, Torx, Metric, SAE
3/8 ", 5/16 ", 7/16 ", 9/16 ", 11/16 "
1-1/2, 1/2, 1/4, 2-1/2, 3/8
9.53, 25.4, 6.35, 38.1, 19.05
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphatized, Oxidised, Black Phosphate, Black Oxide