Internal Torx, Internal Hex, External Hex, Hex, TX
Imperial, AF, Torx, Metric, SAE
5/16 ", 7/8 ", 9/16 ", 9 mm, 11/16 "
1-1/2, 2-1/2, 1/2, 3/8, 1
12.5, 38.1, 25.4, 9.53, 6.35
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphated, Gun-metal, Oxidised, Black Phosphate, Black Oxide