Internal Torx, Internal Hex, External Hex, Hex, TX
Torx, AF, Imperial, SAE, Metric
3/16 ", 5.5 mm, 11/16 ", 7/8 ", 9 mm
1-1/2, 1, 2-1/2, 1/2, 3/8
38.1, 12.5, 9.53, 25.4, 19.05
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphatized, Oxidised, Black Phosphate, Black Oxide