The gasket is made of aluminum material, the surface is smooth, does not hurt the hands, anti-rust and wear-resistant, durable. Compact and lightweight design, very convenient to carry, easy installation Available in a variety of sizes, you can choose according to your actual needs. Typically used under the head of a bolt or nut to provide a smooth load bearing surface. 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.