External Torx, Internal Hex, External Hex, Hex, TX
Imperial, AF, Torx, SAE, Metric
5.5 mm, 9/16 ", 3/16 ", 1/4 ", 5/16 "
1/4, 2-1/2, 1/2, 3/8, 3/4
12.5, 19.05, 6.35, 38.1, 9.53
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphatized, Gun-metal, Oxidised, Black Phosphate, Black Oxide