Tronixpro 58mm Pro Series Snap On Lens Cap For Sigma 70-300mm f/4-5.6 APO DG Macro Autofocus 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