Internal Hex, External Hex, Internal Torx, Hex, TX
Imperial, Metric, AF, Torx, SAE
12 mm, 13/16 ", 9/16 ", 5/8 ", 1-1/2 "
1-1/2, 2-1/2, 1/2, 3/8, 3/4
19.05, 12.5, 25.4, 9.53, 6.35
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphatized, Gun-metal, Oxidised, Black Oxide, Black Phosphate