Internal Hex, External Hex, Internal Torx, Hex, TX
Metric, AF, Torx, Imperial, SAE
16 mm, 7/16 ", 25 mm, 28 mm, 10 mm
1/4, 1-1/2, 2-1/2, 1/2, 3/4
38.1, 12.5, 25.4, 6.35, 19.05
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphatized, Gun-metal, Oxidised, Black Phosphate, Black Oxide