These M6 Bolt Screw Washers are made of high quality Titanium Alloy(TC4),Grade 5, which is durable and has a long service life. They are suitable for various applications, such as electronic hardware, instruments, instruments, automobiles, motorcycles, bicycles, furniture, and other industries. The screw washers have a good anti-corrosion and rust resistance, and can effectively prevent loosening and corrosion of screws.