77mm Pro Series Snap On Lens Cap For Tamron SP 70-200mm f/2.8 Di VC USD Zoom Lens, Tamron SP AF 10-24mm f / 3.5-4.5 DI II Zoom Lens This lens cap protects lens surface from dust & shock during storage. Unique snap on design allows easy installation onto the lens & one-step removal from the lens. It fits directly onto the lens with a double-action spring design. Microfiber Cloth 77mm Snap On Lens Cap