72-82mm Step Up Ring Aviation-grade Aluminum Filter Adapter Ring 2-pack with a Cleaning Cloth* FunctionThe step up filter adapter ring allows you to mount larger filters on small lenses, which means if you buy the 72 82mm size, you can mount a 82mm filter on a 72mm camera lens. * MaterialMade of aviation grade aluminum alloy, it is corrosion resistant and not easily deformed, and is suitable for different climate conditions. * High CompatibilityDifferent filter sizes can be adjusted, saving the cost of purchasing multiple filter sizes. *