Internal Hex, Internal Torx, External Hex, TX, Hex
Imperial, AF, Torx, Metric, SAE
15/16 ", 5 mm, 9/16 ", 3/16 ", 11/16 "
1, 3/4, 2-1/2, 1-1/2, 1/2
19.05, 38.1, 6.35, 25.4, 9.53
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphatized, Oxidised, Black Phosphate, Black Oxide