Internal Hex, External Hex, Internal Torx, TX, Hex
Imperial, Torx, AF, Metric, SAE
3/8 ", 5/16 ", 7 mm, 12 mm, 1-1/2 "
1-1/2, 3/8, 1/2, 2-1/2, 3/4
9.53, 12.5, 6.35, 25.4, 38.1
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphatized, Oxidised, Black Phosphate, Black Oxide