Internal Torx, External Hex, Hex, TX, 6-Point
Metric, Imperial, AF, Torx, SAE
9/16 ", 5.5 mm, 19 mm, 5/8 ", 36 mm
1/2, 1-1/2, 3/4, 3/8, 2-1/2
12.5, 9.53, 6.35, 19.05, 25.4
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphatized, Oxidised, Black Phosphate, Black Oxide