Internal Hex, Internal Torx, External Hex, Hex, TX
Metric, AF, Imperial, Torx, SAE
13/16 ", 9/16 ", 3/16 ", 5.5 mm, 17 mm
1-1/2, 1, 2-1/2, 1/2, 3/4
9.53, 6.35, 19.05, 38.1, 12.5
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphated, Gun-metal, Oxidised, Black Phosphate, Black Oxide