External Hex, Internal Torx, Internal Hex, Hex, TX
Metric, Torx, AF, Imperial, SAE
9/16 ", 3/16 ", 26 mm, 25 mm, 9 mm
1-1/2, 1, 1/4, 2-1/2, 3/8
25.4, 12.5, 9.53, 38.1, 19.05
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphatized, Gun-metal, Oxidised, Black Phosphate, Black Oxide