Internal Hex, External Hex, Internal Torx, TX, Hex
AF, Metric, Torx, Imperial, SAE
7/16 ", 5/8 ", 9/16 ", 11/16 ", 25 mm
1, 1-1/2, 1/2, 2-1/2, 3/8
6.35, 25.4, 19.05, 38.1, 9.53
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphatized, Gun-metal, Oxidised, Black Phosphate, Black Oxide