【High-quality materials】The expansion bolts are made of high-quality stainless steel and rubber, which are strong, rust-resistant, high-strength, corrosion-resistant and durable. 【Simple to Use】Toilet seat hinges bolt has a threaded section, when you tighten the bolt, push into the hole to form a good tight fit, and it will expand and tighten into the hole by it -even, without the need for a bolt on the other end of the screw. 【Application】Toilet seat screws are universal and suitable for openings of 13-18mm. Fits most standard toilet seats. It is suitable for the use of the toilet seat in households and other places. 【Package includes】The set contains 3 pairs of different toilet seat parts, sufficient quantity and different types can meet your installation needs. 【Product Features】Suitable size, excellent toughness and stability, with built-in adjustment range, easy to install, easy to disassemble, and easy to clean.