High-quality material: The hinge is made of high-quality zinc alloy, which is durable and corrosion-resistant, and can be used for a long time without being easily damaged and oxidized. CORROSION RESISTANT: The small screws are made of corrosion-resistant stainless steel, ideal for humid or low airflow environments. Easy to install: This set comes with all accessories and should be easy to install, the only thing you need is a screwdriver. The set contains 2 chrome hinges, 2 fixing bolts, 2 fixing nuts, 4 plastic washers, 8 screws. Wide application: This set fits most sizes of toilet seats. Whether it is solid wood, resin or a toilet seat. Please take a few seconds to read the size reference in the picture.