Internal Torx, Internal Hex, External Hex, Hex, TX
Metric, AF, Imperial, Torx, SAE
7/32 ", 5.5 mm, 11/16 ", 5/16 ", 9/16 "
1/4, 3/4, 1-1/2, 2-1/2, 3/8
12.5, 38.1, 6.35, 19.05, 25.4
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphatized, Oxidised, Black Phosphate, Black Oxide