Tronixpro 58mm Pro Series Snap On Lens Cap For Canon EF 100mm f/2 USM Lens, Canon EF 100mm f/2.8 Macro USM Lens, Canon EF 28mm f/1.8 USM 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 58mm Snap On Lens Cap