The Caruba Step up/down Ring allows for flexible use of filters with different diameters. With this adapter, you can attach a 67 mm filter to a 55 mm lens, providing you with an expanded selection of filter options. The ring is specifically designed for use with Caruba products, ensuring a precise fit. The inner size of 55 mm and the outer size of 67 mm ensure that the adapter sits securely and stably on the lens without any unwanted movement. This Step up/down Ring is a practical accessory for photographers looking to enhance their creative possibilities by using various filters for different shooting situations. The use of the adapter is straightforward and allows for quick changes between different filters without the need for additional tools. Thus, the Caruba Step up/down Ring is a valuable addition to any photography equipment.