【Premium Material】 The toilet seat hinge clips are made of rubber and stainless steel. The rubber is more resistant to dirt and wear, and is not easy to break. Protected by 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. When you tighten the screw, it expands and pulls into the hole without the need to screw in the other end. 【Hinge Plates】 The round hinge plate makes these toilet hole bolts more rigid and stronger. When tightening the screws that the washers push into the holes, be careful not to tighten the screw so much that it pushes through the washer. 【Wide Applications】A strong, reliable, and sturdy mounting kit specially designed for toilet mounting brackets. The toilet lid seat fittings fit some standard toilet seats with Top-Fix hinges (toilet seat hole size 14-15mm). Convenient and time-saving. 【Package Includes】You will receive 2 pieces of toilet hinge blind hole fittings with expansion rubber bolts, nuts, and washers, easy for your daily use. You only need to assemble the toilet lid top fittings and toilet seat hinges once, which can be used for several years.