Rubber design: the rubber bungs can slide into the holes easily, and when you tighten the bolts, they squash up in the holes to make a tight fit, convenient to use. How to install: the toilet seat has a threaded section so you can just push it into the holes on the top of the toilet pan, and when you tighten the , it can expand and tighten into the hole by itself, without using bolts to tighten the other end of the . Package includes: you get 10 pieces black toilet seat screws that have enough quantity to replace old and broken screws and get convenience to use the toilet better in your . material: these toilet seat screws are made of stainless steel and rubber, which are not easy to rust or get broken, making these screws can last longer than others, and can provide you better user experience. Universal fit: these screws fit for most standard toilet seats with top fixing hinge, especially suitable for 14 - 16 mm hole; And the way of installation is simple and convenient so they are choice for most toilets.