External Hex, Internal Hex, Internal Torx, TX, Hex
Metric, AF, Imperial, Torx, SAE
9/16 ", 5 mm, 3/16 ", 9 mm, 1-1/2 "
1/2, 1-1/2, 2-1/2, 1/4, 3/4
9.53, 25.4, 6.35, 19.05, 12.5
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphatized, Gun-metal, Oxidised, Black Phosphate, Black Oxide