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