External Hex, Internal Torx, Internal Hex, TX, Hex
AF, Torx, Metric, Imperial, SAE
9/32 ", 7/8 ", 5.5 mm, 5/16 ", 9/16 "
1/4, 3/8, 2-1/2, 3/4, 1/2
25.4, 38.1, 6.35, 19.05, 9.53
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphatized, Oxidised, Black Phosphate, Black Oxide