Internal Hex, Internal Torx, External Hex, Hex, TX
Torx, Imperial, AF, Metric, SAE
4.5 mm, 9/32 ", 5.5 mm, 5/16 ", 1-1/2 "
9.53, 19.05, 6.35, 25.4, 12.5
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphatized, Oxidised, Black Phosphate, Black Oxide