Description: Starlock Washer provides spring force between two attachments and grip shaft firmly in place. These push-on washers create a permanent installation and will lock firmly. 304 Stainless steel is a good choice for spring washer due to its good corrosion resistant performance in dry environments. Widely used in machinery equipment, industrial production of shock absorption, bearings, machinery, etc. The Starlock Washers have teeth that dig into the shaft material, so expect minor scratching.