Internal Hex, Internal Torx, External Hex, Hex, TX
AF, Imperial, Torx, Metric, SAE
9/32 ", 1 ", 5/16 ", 9/16 ", 1-1/2 "
3/4, 1, 3/8, 2-1/2, 1-1/2
12.5, 38.1, 9.53, 25.4, 19.05
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphatized, Gun-metal, Oxidised, Black Phosphate, Black Oxide