Internal Hex, Internal Torx, External Hex, Hex, TX
Imperial, Metric, AF, Torx, SAE
12 mm, 15 mm, 5/16 ", 25 mm, 9 mm
1/4, 1, 2-1/2, 1-1/2, 3/4
38.1, 6.35, 12.5, 9.53, 19.05
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphatized, Oxidised, Black Oxide, Black Phosphate