This kit includes 9pcs step up ring and 9pcs step down ring, used to convert the thread size of your lens to the thread size of any other accessories such as filters, hoods lens converters. Owning this set means all the lens accessories can be shared. Features: 9pcs step up ring:37-49mm/49-52mm/52-55mm/55-58mm/58-62mm/62-67mm/67-72mm/72-77mm/77-82mm. 9pcs step down ring: 82-77mm/77-72mm/72-67mm/67-62mm/62-58mm/58-55mm/55-52mm/52-49mm/49-37mm. Convert the thread size of your lens to the thread size of any other accessories. Made of high quality anodized aluminum alloy. Specifications: Brand: Andoer Material: Aluminum alloy Package Size: 10 * 10 * 11cm / 3.9 * 3.9 * 4.3in Package Weight: 165g / 5.8oz Package List: 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 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