[HIGH QUALITY MATERIAL]: This toilet seat fixing set is made of plastic, rubber and robust 304 stainless steel. Exceptionally superior strength and stability to secure your toilet seat. Durable, rustproof and corrosion-resistant, superior to most plastic fasteners. [Unique Design]: The plastic plates are less likely to rust than metal plates. When you tighten the screw, the washer will be pushed into the hole; you need to be careful not to overtighten the screw and push it into the washer. The screws have solid brass threads inside and are not prone to rust. [Easy to Use]: Installation is simple and quick, just insert the rubber nut into the hole, then insert the screw into the rubber tightening nut through the washer and plastic plate, tighten the screw, align the pin with the stainless steel base, insert into the toilet seat mounting hole. [Wide Application]: These toilet seat accessories are universal and fit most standard toilet seats with top hinges. (The detailed dimensions of each toilet seat nut are as shown in the image; please measure before purchasing to ensure your toilet seat can be used correctly). The toilet seat installation kit is ideal for replacing damaged or old toilet seat hinges.Toilet parts - M5 new locking expansion screw *1