EASY INSTALLATION: Our 19" Drum Lens boasts a 16 7/8" Outside Diameter Fitter Neck, including THREE NOTCHES for installation using SET SCREWS ONLY for hassle-free fitting. Prior to ordering, ensure precise measurements and feel free to reach out with any queries. Please note, a restock fee applies to incorrect sizes. Not compatible with ceiling fans. DURABLE DESIGN: Engineered for longevity, featuring water and shatter resistance in a NON-YELLOWING acrylic. Expect enduring quality for your lighting needs. EVENLY-DIFFUSED LIGHTING: Crafted to deliver uniform light diffusion, our lenses utilize premium white acrylic, offering a chic aesthetic and ensuring durability. 19" Drum Lens, designed for effortless installation with its 16 7/8" Fitter Neck. Crafted from high-quality white acrylic, it ensures even light diffusion while offering durability and mold resistance. Ideal for low ceilings, this sleek lens complements modern spaces and is water and shatter resistant, ensuring long-lasting performance. Proudly made in the USA, promising quality and reliability nationwide. (Diffuser only. Fixture not included)