External Hex, Internal Hex, Internal Torx, TX, Hex
AF, Metric, Imperial, Torx, SAE
15/16 ", 13/16 ", 5/16 ", 7/8 ", 9/16 "
2-1/2, 1/2, 3/4, 1/4, 3/8
19.05, 38.1, 12.5, 25.4, 9.53
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphatized, Gun-metal, Oxidised, Black Phosphate, Black Oxide