Internal Hex, External Hex, TX, Hex, External Torx
Imperial, Torx, AF, SAE, Metric
4.5 mm, 5/16 ", 7/32 ", 9/32 ", 11/16 "
1/4, 3/4, 2-1/2, 3/8, 1/2
6.35, 19.05, 12.5, 25.4, 9.53
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphatized, Gun-metal, Oxidised, Black Phosphate, Black Oxide