Internal Hex, External Torx, External Hex, Hex, TX
Imperial, AF, Torx, SAE, Metric
15/16 ", 7/16 ", 5/16 ", 11/16 ", 1-1/2 "
19.05, 38.1, 6.35, 9.53, 25.4
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphatized, Gun-metal, Oxidised, Black Phosphate, Black Oxide