Internal Hex, Internal Torx, External Hex, TX, Hex
AF, Imperial, Metric, Torx, SAE
13/16 ", 5/16 ", 5/8 ", 11/16 ", 25 mm
3/4, 1, 1-1/2, 2-1/2, 1/2
25.4, 19.05, 38.1, 6.35, 9.53
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphatized, Phosphated, Oxidised, Black Oxide, Black Phosphate