Includes: 2 plastic bolts, 2 plastic washers, 4 nuts; and the toilet seat accessories are suitable for 14-18mm holes, meeting the needs of replacement parts and enriching your inventory. HIGH QUALITY MATERIAL: This toilet seat fixing set is made of plastic, rubber and heavy duty 304 stainless steel. Exceptionally superior strength and stability to secure your toilet seat. Durable, rust-proof and anti-corrosion, superior to most plastic fasteners. Unique Design: Plastic plates are less likely to rust than metal plates. When you tighten the screw, the washer will be pushed into the hole, you should 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 quick and easy, 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 picture, please measure before purchasing to ensure that your toilet seat can be used properly) The toilet seat installation kit is ideal for replacing damaged or old toilet seat hinges. Note: The data are all measured manually, please allow 1-3cm error Due to differences in light and display, there may be some color differences, please refer to the actual item received.