[High Quality Materials] The toilet seat hinge fasteners are made of rubber and 304 stainless steel. Rubber is more dust and wear resistant and not easily broken. Under the rubber protection, the metal screws are not easy to rust and last a long time.[size] black expansion ball diameter: 1.8 cm, 0.7 inch (uninflated). Length: 4cm / 1.57 inch. White screw size: 4.5, 0.5 cm. Nylon Spacer Nut Size: 3.7.1.8cm. Disc diameter: 1.4cm. (Detailed dimensions of each toilet seat nut are shown, please measure them before purchase to ensure your toilet seat works properly. [Easy to install] The rubber grommets have a threaded section so you can easily insert them into the holes at the top of the toilet. When you tighten the screw, it expands and pulls into the hole without needing the other end of the screw. [Modern Design] The hinge is elegant in silver and can be combined with toilet lids of different styles and colors. It's simple and beautiful. It is the best choice for bathroom accessories. [Note] Before purchasing, remove the old toilet lid bracket and compare the dimensions with the new ceiling bracket. To ensure proper operation, the old toilet lid hinge must have the same value or at least a narrow value.