Internal Torx, External Hex, Hex, TX, External Torx
Imperial, AF, Torx, SAE, Metric
19 mm, 5/16 ", 5/8 ", 9 mm, 25 mm
1-1/2, 1/4, 2-1/2, 3/8, 1
19.05, 25.4, 9.53, 6.35, 38.1
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphated, Gun-metal, Oxidised, Black Phosphate, Black Oxide