Internal Torx, Internal Hex, External Hex, Hex, TX
Imperial, Metric, Torx, AF, SAE
5/16 ", 9 mm, 13/16 ", 3/16 ", 11/16 "
1/2, 3/4, 2-1/2, 1-1/2, 1
19.05, 9.53, 6.35, 25.4, 12.5
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphatized, Gun-metal, Oxidised, Black Phosphate, Black Oxide