Internal Torx, Internal Hex, External Hex, TX, Hex
Imperial, AF, Metric, Torx, SAE
5/16 ", 5/8 ", 9/16 ", 3/16 ", 33 mm
1/4, 1-1/2, 3/8, 2-1/2, 1
19.05, 38.1, 6.35, 9.53, 25.4
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphatized, Oxidised, Black Oxide, Black Phosphate