External Hex, Internal Torx, Internal Hex, Hex, TX
Imperial, Metric, Torx, AF, SAE
3/16 ", 5/8 ", 9/16 ", 11/16 ", 1-1/2 "
1/4, 3/4, 1-1/2, 2-1/2, 1/2
9.53, 19.05, 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