Internal Hex, Internal Torx, External Hex, Hex, TX
Imperial, Torx, AF, SAE, Metric
4 mm, 5.5 mm, 3/16 ", 11/16 ", 35 mm
38.1, 19.05, 25.4, 9.53, 12.5
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphatized, Gun-metal, Oxidised, Black Phosphate, Black Oxide