The step-up filter adapter ring allows you to mount larger filters on small lenses, which means if you buy the 77-82mm size, you can mount a 82mm filter on a 77mm camera lens. Made of aviation-grade aluminum alloy, it is corrosion-resistant and not easily deformed, and is suitable for different climate conditions. The surface of the frame has been oxidized and sandblasted to effectively prevent stray light from entering. Small size, light weight, easy to carry. It is simple and convenient to assemble and disassemble, ready to install and use. An additional vacuum-packed microfiber cleaning cloth is included to ensure that it does not damage the coating of optical instruments such as lenses/filters, does not shed dust, and prevents secondary contamination.