External Hex, Internal Torx, Internal Hex, TX, Hex
AF, Metric, Imperial, Torx, SAE
15/16 ", 5.5 mm, 25 mm, 1-1/2 ", 11/16 "
19.05, 25.4, 9.53, 38.1, 6.35
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphatized, Gun-metal, Oxidised, Black Phosphate, Black Oxide