Internal Hex, Internal Torx, External Hex, Hex, TX
Imperial, Torx, AF, SAE, Metric
7/16 ", 5 mm, 5/16 ", 35 mm, 11/16 "
3/8, 2-1/2, 1/4, 1/2, 3/4
38.1, 12.5, 9.53, 6.35, 19.05
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphated, Phosphatized, Oxidised, Black Phosphate