External Hex, Internal Hex, Internal Torx, Hex, TX
Torx, AF, Imperial, SAE, Metric
17 mm, 5/16 ", 5/8 ", 9/16 ", 1-1/2 "
1/2, 1/4, 3/4, 1-1/2, 2-1/2
6.35, 38.1, 19.05, 9.53, 25.4
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphatized, Gun-metal, Oxidised, Black Phosphate, Black Oxide