External Hex, Hex, TX, External Torx, 6-Point
Imperial, AF, Torx, SAE, Metric
5 mm, 18 mm, 5/16 ", 26 mm, 11/16 "
1/4, 3/4, 2-1/2, 1/2, 3/8
38.1, 9.53, 6.35, 25.4, 19.05
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphated, Gun-metal, Oxidised, Black Phosphate, Black Oxide