Features: These washers are very strong and are perfect for both indoor and outdoor use. Larger outside diameters are ideal for applications that require significant pressure distribution, such as drywall, fencing, mounting fixtures, and sheet metal. Wide range of applications: electrical connections for household and commercial appliances, automotive and marine applications with screw/bolt type connections for power supply Function: The function of the flat washer is to increase the bearing surface area of the screw and reduce the surface pressure exerted on the fastened object. The washers for screws apply to electrical connections, various mechanical parts, household repair, automotive and marine uses, generators and factories, plumbing, automotive, machinery, construction, and DIY projects. Works with wood, metal, plastic, and more.