High quality: zinc alloy hinges, rustproof, antibacterial, zinc alloy hinge, silver plated surface, for MDF toilet seat, wooden toilet seat, resin toilet seat. Corrosion resistance: The small screws are made of corrosion-resistant stainless steel, ideal for humid or low air circulation environments. Washers and nuts: Washers and nuts: rubber, Rubber washers are a large and durable rubber mounting nut with limited space. Easy Installation: This set comes with all fittings and should install easily, all you need is a screwdriver. The zinc alloy toilet lid can be used for a long time, without oxidation, corrosion, easy to clean. zinc alloy, rustproof, antibacterial, electroplated surface is not easy to fall off. Perfect for use in bathroom, hotel, public places, etc.