Internal Torx, Internal Hex, External Hex, Hex, TX
Imperial, AF, Torx, SAE, Metric
5/8 ", 5.5 mm, 7 mm, 5/16 ", 25 mm
1/2, 1, 1-1/2, 2-1/2, 3/8
9.53, 6.35, 19.05, 38.1, 12.5
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphatized, Gun-metal, Oxidised, Black Phosphate, Black Oxide