Features:1. Made of high quality aluminum alloy material, solid, durable, wear resistant, and long life time.2. Transform caliber adapter ring, which can be installed in front of the lens to achieve that different diameter share same diameter filter, hood, additional lens or other accessories.3. Small-diameter outer thread of the ring is the connection end of the lens, while large-diameter internal thread can use a variety of same caliber filters UV, CPL, starlight mirror, gray mirror, close-up lens hood, etc.4. Lightweight and portable. Easy to install.5. They are small turn up conversion caliber adapter rings.Specifications:Material: Aluminum AlloyColor: BlackApplicable Model: GeneralPacking List:1 * 49mm-52mm Adapter Ring1 * 52mm-55mm Adapter Ring1 * 55mm-58mm Adapter Ring1 * 58mm-62mm Adapter Ring1 * 62mm-67mm Adapter Ring1 * 67mm-72mm Adapter Ring1 * 72mm-77mm Adapter Ring1 * 77mm-82mm Adapter Ring.