This Yadsux step up adapter ring allows you to fit a 82mm filter onto a 55mm lens front. The unit quantity is one and it is a unit type adapter. This product is perfect for photographers who have filters with larger diameters than their current lenses. The adapter ring is made of high-quality materials that ensure durability and longevity. With this adapter, you can easily step up your lens size to accommodate larger filters without having to purchase new filters. This product is a must-have for any photographer who wants to expand their creative options.