49mm 77mm Filter Ring, 49 to 77mm Step UP Ring, it can bed easily screwed onto the front of any Lens with 49mm Filter Diameter, and converts the thread size of your lens to the thread size of any other 77mm accessory The Male Side: 49mm The Female Side: 77mm Made of high quality anodized aluminum and polished with strict surface treatment to avoid wobbling or cross-threading, combined with a slim design makes this ring durable and functional. Step Up Ring 49 to 77mm, suitable for a wider variaty of 77 mm Filters, Adapters, Hoods and more.