Universal Kit: The product includes 3 pairs (6 pieces) of different size toilet seat replacement kits. The detailed size of each toilet seat nut is shown in the image. Please measure before purchasing to ensure compatibility with your toilet seat. High Quality Material: Features rubber stretch balls, ABS plastic round cards, and stainless steel screws. Resistant to rust and corrosion for long-lasting use. Usage: Insert the toilet seat screws into the toilet mounting holes. The rubber washers are designed with threading; simply push them into the holes on the top of the toilet. They will expand and secure themselves in place, offering a convenient and time-saving installation. Universal Fixing: These toilet seat fixings fit 14-18mm holes, making them ideal for replacing broken or worn toilet seat hinges. Compatible with most standard toilet bowls. Suitable for top-mounted toilet seats and wall-hung units.