Internal Hex, External Torx, External Hex, Hex, TX
Imperial, AF, Metric, Torx, SAE
9 mm, 15/16 ", 13/16 ", 7/8 ", 15 mm
6.35, 9.53, 19.05, 25.4, 38.1
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphatized, Gun-metal, Oxidised, Black Phosphate, Black Oxide