Internal Torx, Internal Hex, External Hex, TX, Hex
Imperial, Torx, AF, SAE, Metric
7/16 ", 8 mm, 7/8 ", 3/16 ", 9/16 "
1-1/2, 1/2, 2-1/2, 3/8, 1
38.1, 19.05, 6.35, 25.4, 12.5
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphatized, Oxidised, Black Phosphate, Black Oxide