Internal Hex, Internal Torx, External Hex, Hex, TX
Imperial, AF, Torx, SAE, Metric
15/16 ", 7/16 ", 7 mm, 5/16 ", 11/16 "
1-1/2, 2-1/2, 1/2, 3/8, 1
38.1, 12.5, 6.35, 9.53, 19.05
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphatized, Oxidised, Black Phosphate, Black Oxide