Package Includes 2pcs x Lampshade Diffuser Dimension Lampshade Diffuser Diameter:11.6"/29.5cm Center Hole Dia: 3/8"/10mm Thickness:0.06"/1.5mm Fits 12"-13" Lampshade Openings Key Features & Notes Used to improve glare and create a comfortable environment for reading or work. It is easy to install the lampshade diffuser on various lamps and focuses light downward for better illumination. Before use, the protective film must be removed, and the lamp shade's inner diameter should be checked for compatibility.