Internal Hex, External Hex, Internal Torx, Hex, TX
Imperial, Metric, Torx, AF, SAE
11/16 ", 5.5 mm, 7/16 ", 28 mm, 1-1/2 "
9.53, 6.35, 38.1, 25.4, 19.05
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphated, Gun-metal, Oxidised, Black Oxide, Black Phosphate