Internal Hex, External Hex, Internal Torx, TX, Hex
Imperial, Metric, Torx, AF, SAE
7/16 ", 11/16 ", 3/4 ", 11 mm, 34 mm
1/4, 1-1/2, 3/4, 2-1/2, 1/2
38.1, 6.35, 25.4, 19.05, 9.53
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphatized, Oxidised, Black Phosphate, Black Oxide