Internal Hex, Internal Torx, External Hex, Hex, TX
Torx, Metric, Imperial, AF, SAE
13 mm, 3/16 ", 5.5 mm, 5/16 ", 35 mm
38.1, 19.05, 25.4, 6.35, 9.53
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphatized, Oxidised, Black Phosphate, Black Oxide