Features: Step up ring set allows bigger size filter to fit on lens with smaller filter thread size. All the rings can be screw together for easy to store and carry. Made of high quality anodized black aluminum. The set also can be used as a lens hood, this means that you don't need to waste extra money to a single lens hood. This is a very perfect product for your photography. Compatible with the Canon, Nikon, Sigma, Tamron,Sony,Fuji Camera lens. Precision made from premium-grade aluminum,solid and light-weight. Great tightness, no wobbling or cross-threading. The first number is always the lens thread size, the second number is the filter size of the accessory. If the first number is smaller, it's a step-up. 9pcs Step Up Ring Kit Includes: 1 * 37-49mm step-up ring 1 * 49-52mm step-up ring 1 * 52-55mm step-up ring 1 * 55-58mm step-up ring 1 * 58-62mm step-up ring 1 * 62-67mm step-up ring 1 * 67-72mm step-up ring 1 * 72-77mm step-up ring 1 * 77-82mm step-up ring 9pcs Step Down Ring Kit Includes: 1 * 82-77mm Step Down Ring 1 * 77-72mm Step Down Ring 1 * 72-67mm Step Down Ring 1 * 67-62mm Step Down Ring 1 * 62-58mm Step Down Ring 1 * 58-55mm Step Down Ring 1 * 55-52mm Step Down Ring 1 * 52-49mm Step Down Ring 1 * 49-37mm Step Down Ring 18pcs (9 Up+9 Down) Kit Includes: 9pcs Step Up Ring + 9pcs Step Down Ring