Excellent material: The toilet seat fixing screw is made of high quality rubber and stainless steel. Good flexibility, sturdiness, durability, not easy to slide, not easy to break and rust. Package Contents: The toilet seat fixing kit includes 2 pairs of expansion screws, including expansion balls, screws and washers. Universal Toilet Seat Screw: These toilet seat screw accessories are universal, suitable for 13-18mm openings, and suitable for most standard toilet seats. Easy to install: You can easily assemble them in just a few minutes. Insert the toilet seat screw into the toilet installation hole and tighten the screw, which is convenient and time-saving. Perfect Repair: Replace the old fixing parts by connecting the toilet seat screw, firmly fix the seat and perfectly repair the faults of the toilet soft closing mechanism at home and save a lot on the new purchase.