Material Plastic,Rubber Shape Round Expansion ball diameter: Approx. 1.7 cm/ 0.67 inch (unexpanded state) Length: Approx. 4cm/1.57 inch White plastic circle card diameter:Approx. 2.8cm/ 1.1 inch Package Includes: 4 x toilet seat screws About this item toilet seats- If your toilet seat kept moving, please use these toilet seat fixing screws to replace the useless plastic inserts supplied with a new top fix seat. Fits for most standard toilet seats with top fix hinge. Suitable for 14 - 16mm hole Round Hinge Plate- The round hinge plate make this extra sturdy and ideal. If your current seat fittings are loose making your toilet seat move around on the pan Flexible Rubber BungsRubber bungs slide into the perfect holes and when you tighten the bolts they squash up in the holes making a good tight fit. Please do not over tighten the bolt QualityMaterial- Plastic washer will not rust like metal. Brass nuts can antiskid and antirust. You don't need to tight screw from bottom with these toilet seat hinges screws. These rubber toilet seat bolts provide great friction against the ceramic bowl holes therefore excellent grip compared to plastic Size Information- Expansion ball diameter: Approx. 1.7 cm/ 0.67 inch (unexpanded state). Length: Approx. 4cm/1.57 inch.