Internal Hex, Internal Torx, External Hex, TX, Hex
Imperial, AF, Torx, SAE, Metric
4.5 mm, 9/32 ", 13/16 ", 9/16 ", 26 mm
1-1/2, 2-1/2, 3/8, 1/2, 1
6.35, 19.05, 25.4, 12.5, 9.53
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphatized, Oxidised, Black Phosphate, Black Oxide