External Hex, Internal Hex, Internal Torx, Hex, TX
Torx, AF, Imperial, Metric, SAE
8 mm, 9/16 ", 5.5 mm, 23 mm, 29 mm
3/8, 2-1/2, 1-1/2, 1/2, 1/4
25.4, 38.1, 12.5, 6.35, 19.05
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphatized, Oxidised, Black Phosphate, Black Oxide