Internal Hex, Internal Torx, External Hex, TX, Hex
Torx, Metric, AF, Imperial, SAE
5/16 ", 3/8 ", 5/8 ", 34 mm, 23 mm
2-1/2, 1-1/2, 1/2, 3/8, 1
19.05, 25.4, 9.53, 38.1, 6.35
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphatized, Oxidised, Black Phosphate, Black Oxide