Internal Hex, External Hex, External Torx, Hex, TX
Imperial, AF, Torx, Metric, SAE
7/16 ", 3/16 ", 15 mm, 1/4 ", 11/16 "
1-1/2, 1/4, 2-1/2, 3/4, 1/2
19.05, 9.53, 38.1, 6.35, 25.4
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphated, Gun-metal, Oxidised, Black Phosphate, Black Oxide