Internal Hex, External Hex, Internal Torx, Hex, TX
Imperial, Torx, AF, SAE, Metric
15 mm, 13/16 ", 12 mm, 3/16 ", 5/8 "
1-1/2, 3/4, 1, 2-1/2, 1/2
38.1, 25.4, 9.53, 19.05, 6.35
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphatized, Gun-metal, Oxidised, Black Oxide, Black Phosphate