Internal Hex, Internal Torx, External Hex, Hex, TX
Imperial, Torx, AF, SAE, Metric
7/8 ", 5 mm, 13 mm, 5/16 ", 11/16 "
1/4, 1-1/2, 3/4, 1/2, 3/8
12.5, 9.53, 19.05, 38.1, 6.35
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphated, Gun-metal, Oxidised, Black Phosphate, Black Oxide