The Sensei 48-55mm Aluminum Step-Up Ring permits the use of 55mm threaded filters on lenses with 48mm filter threads. It features a lightweight, aluminum alloy construction that has a corrosion-resistant, black anodized finish for durability.
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I have step-up rings from at least 5 different brands and the Sensei ones are just as well made as the more expensive ones. The only difference is if they are made of brass which makes them easier to remove if you need to exchange them often.
I always buy the Sensei Step-Up Ring when I need one. For the price, it is good quality, thin and does the job. B&H Photo has great customer service, they always ship my orders fast.