High Quality Materials: The hinge is made of high quality zinc alloy, durable and corrosion resistant, can be used for a long time without being easily damaged and oxidized. Corrosion Resistance: The small screws are made of corrosion resistant stainless steel, ideal for humid or low air circulation environments. Easy Installation: This set comes with with all fittings and should be easily installed, the only thing you need is a screwdriver. This set contains 2 x Chrome Hinges, 2 x Fixing Bolts, 2 x Fixing Nuts, 4 x Plastic Washers, 8 x Screws. Wide Applications: This set is suitable for most sizes of toilet seat. Whether it is solid wood, resin or MDF toilet cover. Please take a few seconds to read the size reference on the picture.