Refresh your SB Series narrow body wraparound ceiling light fixture with this 4 foot replacement acrylic diffuser lens from Lithonia Lighting. The clear prismatic acrylic uses linear side prisms to control brightness, while pyramidal bottom prisms minimize lamp image for the clean look of a flat-bottom diffuser. Sized 48 in L x 8-5/8 in W x 2-5/8 in H, it fits the SB narrow body square profile 4' light fixture commonly used as closet lights, garage lights, and shop lights. Rigid acrylic construction and continuous diffuser support resist everyday use and simplify maintenance; rated for damp locations. This lens helps restore uniform, glare-controlled illumination to your ceiling light or work light. Purchase includes lens only; no hardware or light fixture included. Please verify measurements and model compatibility before ordering. Backed by a 1-year limited warranty.