The Century Precision Optics 67-86mm Step-Up Ring permits the use of 86mm threaded filters on lenses with 67mm filter threads. It features a lightweight, aluminum-alloy construction that has a corrosion-resistant, black anodized finish for durability. This step-up ring has knurlings along the edge of its side farthest from its rear threads. This provides a more textured grip when mounting or removing it from a lens.