Internal Hex, Internal Torx, External Hex, Hex, TX
Imperial, AF, Torx, Metric, SAE
4 mm, 7/32 ", 12 mm, 3/8 ", 11/16 "
3/4, 1-1/2, 3/8, 2-1/2, 1/2
38.1, 6.35, 25.4, 9.53, 19.05
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphatized, Gun-metal, Oxidised, Black Phosphate, Black Oxide