High-quality materials: The hinge is made of high-quality zinc alloy, is durable and corrosion-resistant, and can be used for a long time without being easily damaged or oxidized. Corrosion resistance: The small screws are made of corrosion-resistant stainless steel and are ideal for humid environments or environments with little air circulation. Easy installation: This set comes with all hardware and should be easy to install. All you need is a screwdriver. This set includes 2 x chrome hinges, 2 x mounting bolts, 2 x mounting nuts, 4 x plastic washers, and 8 x screws. Versatile applications: This set is suitable for most toilet seat sizes, whether the toilet lid is made of solid wood, resin, or MDF. Please take a few seconds to read the size reference in the picture.