Premium material The toilet seat hinge fasteners are made of rubber and stainless steel, the rubber is more resistant to dirt and wear, and not easy to break. Under the protection of the rubber, the metal screws are less prone to rust and durable for long term use.Easy to install The rubber grommets have a threaded section so you can simply insert them into the holes at the top of the toilet bowl. As you tighten the screw, it expands and pulls into the hole without the need to screw in the other end of the screw.Hinge Plates The round hinge plate ut make these toilet hole bolts stiffer and stronger. When tightening the screws that the washers push into the holes, you must be careful not to overtighten the screw so much that it pushes through the washer. designed for toilet mounting brackets. Convenience and time saving.Package Include You will get 2 Pieces of toilet hinged blind hole fittings with expansion rubber bolts, nuts, washers, easy for your daily use. You only need to assemble the top fittings of the toilet lid and the toilet seat hinge once, which can be used for several years.Size: please refer to the size chart Note: The data is manual measurement, please allow 1-37cm error, due to differences between light and screen, there will be a certain color difference, the specific received in kind prevail .