Internal Hex, External Hex, TX, Hex, External Torx
Imperial, Torx, AF, SAE, Metric
5.5 mm, 5/8 ", 11/16 ", 25 mm, 29 mm
1-1/2, 1/4, 2-1/2, 1/2, 3/8
6.35, 25.4, 19.05, 9.53, 38.1
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphatized, Oxidised, Black Phosphate, Black Oxide