External Hex, Internal Hex, Internal Torx, Hex, TX
AF, Torx, Imperial, Metric, SAE
3/16 ", 4.5 mm, 5 mm, 12 mm, 5/16 "
3/4, 3/8, 1-1/2, 2-1/2, 1
12.5, 9.53, 38.1, 19.05, 25.4
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphatized, Phosphated, Oxidised, Black Phosphate, Black Oxide