External Hex, Internal Hex, Internal Torx, Hex, TX
Imperial, Metric, AF, Torx, SAE
4 mm, 9/32 ", 5/8 ", 5 mm, 5/16 "
1, 1-1/2, 3/4, 3/8, 2-1/2
6.35, 25.4, 9.53, 19.05, 38.1
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphatized, Oxidised, Black Phosphate, Black Oxide