The NiSi V6 Protection Lens Cap is designed to attach to a NiSi V6 100mm holder's 82mm adapter ring when the kit's filter holder is removed. While in use, this lens cap can protect a NiSi 86mm Circular Polarizer Filter installed on that 82mm adapter ring while the adapter ring remains on a lens.Note: This lens cap is NOT compatible with the V5 or V5 Pro.