Internal Hex, External Hex, Internal Torx, Hex, TX
Metric, AF, Torx, Imperial, SAE
9/32 ", 9/16 ", 17 mm, 5/16 ", 11/16 "
1-1/2, 2-1/2, 3/8, 1/2, 3/4
38.1, 19.05, 6.35, 25.4, 9.53
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphatized, Oxidised, Black Oxide, Black Phosphate