Ensure the longevity and stability of your mechanical connections with the manganese steel anti-vibration safety washers. These double-stacked self-locking wedge washers are designed to prevent bolts and screws from loosening under vibration. For use in bicycles and machinery, simply place the washers between the bolt head and the mounting surface for a reliable and secure fastening solution. Features -Color:Silver -Material:Manganese steel -Size:1.70X1.70X0.20cm/0.67X0.67X0.08in Inner diameter:1cm -Reliable fastening: designed to fit corresponding sizes of bolts, screws, and other fasteners, ensuring a secure and tight connection that resists loosening -Safety assurance: widely used in mechanical, construction, transportation, and infrastructure projects, these washers provide enhanced safety and reliability -Effortless installation: easy to install by placing the washer between the fastener and the mating surface, with the wedge locking mechanism activating upon tightening -Advanced design: the double wedge design with interlocking teeth creates tension between bolts and nuts, effectively preventing loosening due to vibrations - construction: made from manganese steel, these washers offer exceptional strength and durability, capable of withstanding heavy loads and harsh conditions Package list: 20 x Wedge Locking Washer