Material Plastic, Rubber Round Shape Diameter of the expansion ball: approx. 1.7 cm/ 0.67 inch (unexpanded state) Length: approx. 4cm/1.57inch Diameter of white plastic circle card: approx. 2.8 cm/ 1.1 inch Package includes: 4 x Toilet seat screws About this item 【toilet seats】- If your toilet seat keeps moving, please use these toilet seat fixing screws to replace the unnecessary plastic inserts that come with a new top fixing seat. Fits most standard toilet seats with top hinge. Suitable for 14-16mm hole 【Round hinge plate】The round hinge plate makes it very sturdy and ideal. If your current seat fittings are loose causing your toilet seat to move on the tray 【Flexible rubber plugs】- The rubber plugs slide snugly into the holes and when you tighten the bolts they squash into the holes for a good fit. Please do not overtighten the bolt 【Quality material】- The plastic washer does not rust like metal. Brass nuts can be anti-slip and anti-rust. You don’t need to tighten the bottom screw