●REPLACEMENT LENS FOR 12 INCH UNDER CABINET / UNDER COUNTER FLOURESCENT LIGHT: High quality 12 inch (11-7/8 inch nominal length) white acrylic replacement lens cover diffuser for under cabinet fluorescent fixture. Fits several different Lithonia fixtures plus many others. ●100% ACRYLIC NON-YELLOWING FORMULA FOR LONGEVITY: These lenses have ribbing on the outside for maximum light diffusion, and are UV stabilized to prevent yellowing. ●QUALITY AMERICAN MADE PRODUCT: Our lenses are manufactured here in the USA and are made to the same specifications as the covers on the original fixture, and are far superior to cheap imported replacements. ●THIS LENS MEASURES: 11-7/8 inch length x 2-7/8 inch width x 1 inch height (will fit 12 inch light fixture). ●NOT SURE ABOUT SIZING? : A Beam Lighting Plastics Expert is just a phone call or email away.