Internal Hex, Internal Torx, External Hex, TX, Hex
Imperial, Torx, AF, SAE, Metric
15/16 ", 3/16 ", 5.5 mm, 11/16 ", 1-1/2 "
1-1/2, 3/4, 1, 2-1/2, 1/2
9.53, 12.5, 19.05, 6.35, 38.1
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphatized, Oxidised, Black Phosphate, Black Oxide