The 86mm Lens Cap is a center-squeeze snap-on style replacement cap to suit Canon RF lens. It protects the lens from elements such as dust and splash. Product Features in Detail CompatibilityThe Professional Lens Cap is MORE than your everyday lens cap. ProMaster Lens Caps are precision molded for optimum fit and use a center activated locking system that aids in the secure fit of the cap. The ProMaster Professional Lens Cap is the ideal replacement cap for your valuable lens. Available in all popular sizes.