High quality: zinc alloy hinges, antibacterial, 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, The 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. Zinc alloy toilet lid can be used for a long time, no oxidation, corrosion, easy to clean. zinc alloy, rustproof, antibacterial, electroplated surface is not easy to fall off. the salfalization sunbathroom, hotel, public places, etc.