Lens Filter Protection:Lens filter protector case could keep your filters from dust,scratches and fingerprints while not in use Stack Caps:These lens filter caps with same size are stackable,just screw your filters together,then screw the stack caps on the top and bottom of your stack Portable:The metal covers make your filters more organized,easy to carry and they only takes up a little space,very convenient High Quality:The screw in lens filter stack caps are made of high quality aluminum alloy,wear resistance,very durable Universal:Filter stack caps are a convenient way to organize your camera lens filters,7 sizes optional,fits for most lens filters,such as UV CPL filters