Internal Hex, Internal Torx, External Hex, TX, Hex
Metric, AF, Imperial, Torx, SAE
7/16 ", 9/32 ", 5/8 ", 5/16 ", 11/16 "
19.05, 25.4, 9.53, 38.1, 6.35
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphated, Phosphatized, Oxidised, Black Phosphate, Black Oxide