Internal Torx, External Hex, Internal Hex, TX, Hex
Imperial, Metric, Torx, AF, SAE
7 mm, 5/16 ", 26 mm, 25 mm, 1-1/2 "
1, 1-1/2, 2-1/2, 1/2, 3/8
25.4, 38.1, 6.35, 9.53, 19.05
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphated, Oxidised, Black Phosphate, Black Oxide