External Hex, Internal Hex, Internal Torx, Hex, TX
Torx, AF, Imperial, SAE, Metric
3/16 ", 15 mm, 9/16 ", 11/16 ", 28 mm
1/4, 3/4, 2-1/2, 1-1/2, 1
6.35, 12.5, 25.4, 19.05, 9.53
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphatized, Gun-metal, Oxidised, Black Phosphate, Black Oxide