The NiSi Ti Pro 55-58mm Titanium Step Up Ring allows the use of 58mm threaded filters on lenses with 55mm standard filter threads. Featuring a lightweight titanium frame with Knurled sides for easier grip. The Titanium frame offers unparalleled strength, is corrosion resistant and will not bend like standard step up rings. The Titanium Step up ring prevents binding and jamming making it easier to remove compared to standard setup rings. The NiSi Ti Pro 55-58mm Titanium Step Up Ring has an anti-reflective felt treatment on the inside of the frame to minimise reflections and features a matte black finish. The anti-reflective felt treatment make them the perfect companion for long exposures.