Description: Transform caliber adapter ring, it can be installed in front of the lens to achieve different share the same lens diameter filter diameter, hood, additional lens or other accessories to achieve the objective of increase the diameter of the lens. The adapter ring is aluminum alloy, black, durable; small-diameter external thread (lens end connection), a large-diameter internal thread (take a variety of filters of the same gauge UV, CPL, starlight mirror, gray mirror, close-up lens hood, etc ... ). Lightweight and portable, easy to install, and can save money, others can also improve some of the more corners of the problem; Ring is a small back up gauge ring conversion adapter. Specification: Material: Aluminum Set To: Universal Quantity:7 pcs Package Includes: 7pcs*Ring(49-52mm 52-55mm 55-58mm 58-62mm 62-67mm 67-72mm 72-77mm) Note: 1. Due to the light and screen difference, the item's color may be slightly different from the pictures. 2. Please allow 1-2 cm differences due to manual measurement.