Internal Hex, Internal Torx, External Hex, Hex, TX
Imperial, Torx, AF, Metric, SAE
12 mm, 5/16 ", 7/16 ", 5/8 ", 11/16 "
1/4, 3/4, 1-1/2, 2-1/2, 1/2
6.35, 19.05, 25.4, 9.53, 12.5
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphatized, Gun-metal, Oxidised, Black Phosphate, Black Oxide