External Hex, Internal Torx, Internal Hex, Hex, TX
Imperial, AF, Torx, SAE, Metric
11/16 ", 5/8 ", 7/8 ", 28 mm, 1-1/2 "
1/4, 1-1/2, 2-1/2, 1/2, 3/4
38.1, 19.05, 9.53, 6.35, 25.4
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphated, Gun-metal, Oxidised, Black Oxide, Black Phosphate