Step Down Rings for Filters, K&F Concept Metal 11pcs Lens Filter Step Down Adapter Ring Kit 43-37MM 52-43MM 55-52MM 58-55MM 62-58MM 67-62MM 72-67MM 77-72MM 82-77MM for DSLR Camera Kit Includes: Generic Metal 11pcs Step Down Ring 30-26MM,37-30MM,43-37MM,52-43MM,55-52MM,58-55MM,62-58MM,67-62MM,72-67MM,77-72MM,82-77MM Compatible with the Canon, Nikon, Sigma, Tamron Camera Superfine frame polished with strict surface treatment The first number is always the lens thread size, the second number is the filter size of the accessory. If the first number is larger, it's a step-down. We engaged in Camera Accessories Industry for many years. Promise high quality, competitive prices and excellent customer service.