Internal Hex, Internal Torx, External Hex, TX, Hex
Imperial, AF, Torx, Metric, SAE
4.5 mm, 9/32 ", 5/16 ", 5/8 ", 35 mm
1/2, 1-1/2, 3/4, 2-1/2, 3/8
25.4, 38.1, 19.05, 9.53, 6.35
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphatized, Oxidised, Black Phosphate, Black Oxide