External Hex, Internal Torx, Internal Hex, Hex, TX
Imperial, AF, Torx, SAE, Metric
6 mm, 5 mm, 5.5 mm, 13 mm, 7/16 "
12.5, 9.53, 38.1, 19.05, 25.4
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphated, Phosphatized, Oxidised, Black Phosphate, Black Oxide