Internal Hex, External Torx, External Hex, Hex, TX
Imperial, Metric, AF, Torx, SAE
12 mm, 7/8 ", 3/16 ", 5/8 ", 11/16 "
1/4, 1-1/2, 3/4, 2-1/2, 1/2
38.1, 25.4, 6.35, 9.53, 19.05
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphatized, Gun-metal, Oxidised, Black Phosphate, Black Oxide