Internal Hex, External Torx, External Hex, TX, Hex
Metric, AF, Imperial, Torx, SAE
7/16 ", 11/16 ", 9/16 ", 17 mm, 5/8 "
25.4, 6.35, 19.05, 9.53, 38.1
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphatized, Gun-metal, Oxidised, Black Phosphate, Black Oxide