Internal Hex, External Hex, Hex, TX, External Torx
Imperial, AF, Torx, Metric, SAE
5.5 mm, 15 mm, 9/16 ", 29 mm, 1-1/2 "
1/4, 1-1/2, 2-1/2, 3/4, 1/2
19.05, 38.1, 25.4, 6.35, 9.53
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphatized, Gun-metal, Oxidised, Black Phosphate, Black Oxide