LAXED Adapter Rings are suitable for attaching filters, close-up lenses and filter thread sizes Bower 49-77mm step-up adapter ring easily screws onto the front of a 49mm lens and converts to 77mm accessory items (filters, hood, flash, lens converter, etc) Package includes: 3 x step up adapter ring Package contents are above and not included Note: Color and size of the websites may vary slightly depending on lighting shooting and display. In addition, the measurement allowed error is allowed. Range 1-3cm.