Internal Hex, External Hex, Hex, TX, 6-Point
Metric, AF, Torx, Imperial, SAE
5.5 mm, 6 mm, 9/32 ", 9 mm, 9/16 "
9.53, 12.5, 6.35, 25.4, 19.05
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphatized, Gun-metal, Oxidised, Black Phosphate, Black Oxide