External Hex, Internal Hex, External Torx, Hex, TX
Metric, Torx, AF, Imperial, SAE
5.5 mm, 7/32 ", 5/16 ", 28 mm, 11/16 "
9.53, 6.35, 19.05, 12.5, 38.1
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphatized, Gun-metal, Oxidised, Black Phosphate, Black Oxide