Internal Torx, Internal Hex, External Hex, Hex, TX
Imperial, AF, Torx, Metric, SAE
5.5 mm, 15/16 ", 5/8 ", 9/16 ", 1-1/2 "
1, 1-1/2, 2-1/2, 1/2, 3/8
19.05, 25.4, 9.53, 6.35, 38.1
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphatized, Gun-metal, Oxidised, Black Phosphate, Black Oxide