Internal Torx, Internal Hex, External Hex, TX, Hex
Imperial, Metric, Torx, AF, SAE
5/16 ", 5/8 ", 11/16 ", 26 mm, 1-1/2 "
3/4, 1, 1-1/2, 2-1/2, 1/4
25.4, 19.05, 6.35, 38.1, 12.5
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphatized, Gun-metal, Oxidised, Black Phosphate, Black Oxide