High quality: zinc alloy hinges, rustproof, antibacterial, zinc alloy hinge, silver plated surface, for toilet seat wooden toilet seat, resin toilet seat. Resistance corrosion resistant: 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 make a large, durable rubber mounting nut with limited space. Easy Installation: This set comes complete 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. Perfect for use in bathroom, hotel, public places, etc.