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