Internal Hex, External Hex, Internal Torx, TX, Hex
Torx, Imperial, Metric, AF, SAE
5/8 ", 18 mm, 5/16 ", 25 mm, 9 mm
3/4, 1, 1-1/2, 2-1/2, 1/2
12.5, 6.35, 25.4, 19.05, 9.53
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphatized, Oxidised, Black Phosphate, Black Oxide