These round acrylic boards are commonly used as a dustproof cover put on the top or bottom of the lamp shade. Widely used on chandeliers, pendant lights, desk lamps, floor lamps, table lamps, and so on. Specification: Material: Metal, Acrylic Inner Diameter: 152mm / 6" Acrylic Board Thickness: 1mm / 0.04" Packing List: 2pcs x Lampshade Diffuser Advantage: The corrosion resistance of acrylic material can make sure our product work in severe environment long time. Also, it have good light transmission, very suitable for lamp shade. Convenient to clean, you can use a clean cloth wipe to clean directly. The golden metal ring on the edge makes your lamp shade more beautiful. Not just make the light soft, but also directs light downward. Instruction: Easy to use, just directly put the acrylic board on the top or bottom of lamp shade. NOTE: 1.Please check the outer diameter of your lamp shade top or bottom. 2.You can also choose to drill a hole in the center of acrylic board if it is necessary.