Internal Hex, External Hex, Internal Torx, Hex, TX
Imperial, Metric, AF, Torx, SAE
7/32 ", 9/32 ", 9/16 ", 5 mm, 5/16 "
1-1/2, 3/4, 1, 2-1/2, 3/8
9.53, 19.05, 6.35, 12.5, 25.4
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphatized, Oxidised, Black Oxide, Black Phosphate