Internal Torx, External Hex, TX, Hex, External Torx
AF, Metric, Torx, Imperial, SAE
9/32 ", 11/32 ", 4 mm, 5/16 ", 5/8 "
1-1/2, 1, 2-1/2, 3/8, 3/4
38.1, 12.5, 25.4, 19.05, 6.35
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphatized, Gun-metal, Oxidised, Black Phosphate, Black Oxide