Make the most of your photography equipment with the NiSi Brass Pro 40.5-52mm Step-Up Ring, expertly designed to facilitate the use of 52mm threaded filters on lenses that come with a 40.5mm filter thread. This step-up ring is a testament to durability and quality, crafted from robust brass that ensures longevity and resistance to wear and tear.The construction of the NiSi Brass Pro Step-Up Ring boasts knurled sides, providing photographers with an enhanced grip for effortless attachment and removal. This thoughtful design feature significantly reduces the likelihood of binding and jamming, a common issue with standard aluminum rings, making it a reliable choice for professionals who demand efficiency in their workflow.In addition to its sturdy build, the step-up ring includes a unique anti-reflective felt treatment on the interior of the frame.