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 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 in 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 can make these Stiffer and stronger toilet hole bolts. When tightening the screws that the washers push into the holes, you must be careful not to tighten the screw so much that it pushes through the washer. Wide Applications: A strong mounting kit, reliable and sturdy specially designed for toilet mounting brackets. Toilet lid seat fittings fit most standard toilet seats with hinges. Convenience and time saving. Package includes: You will get 4 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 hinge of the toilet seat only once, which can be used for several years.