Tronixpro 77mm Pro Series Snap On Lens Cap For Sigma 85mm f/1.4 EX DG HSM Lens, Sigma Normal 50mm f/1.4 EX DG HSM Autofocus Lens, Sigma 24mm f/1.8 EX Aspherical DG DF 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 77mm Snap On Lens Cap