Titanium hex nuts can be made of Gr.1,2,5,7and 12 titanium to match different applications. 1) Material: Gr. 1, 2, 5, 7 and 12 titanium to match different applications.2) Metric, DIN, UNC and UNF are available.3) Excellent for chemical, motorcycle, racing and other applications. Titanium Hex Nut