<p>〖High Quality Material〗 The toilet seat fasteners are made of rubber, the screws are made of 304 stainless steel, much better than plastic fasteners. Package includes 4x rubber cork, 4x metal washers, 4x plastic washers, 4x screws.</p> <p> 〖Easy to install〗 The rubber grommets in the kit have a threaded section so you can simply push them into the holes on the top of the toilet bowl and when you tighten the screw , it expands and tightens in the hole, without the need for a bolt on the other end of the screw.</p> <p> 〖Flexible Rubber Stoppers〗 The rubber stoppers slide perfectly into the holes and as you tighten the bolts, they squeeze into the holes for a good fit. Please do not overtighten the bolt.〖Flexible Rubber Plugs〗 The rubber plugs slide snugly into the holes and when you tighten the bolts, they squeeze into the holes for a good fit. Please do not overtighten the bolt.</p> <p>〖Rust-proof design〗: Plastic washers do not rust, better than metal washers. When you tighten the bolts, the washers smash into the holes, you have to be careful not to tighten the bolt so much that it pushes through the washer. The screw has solid brass thread inside can be anti-slip and anti-rust.</p>