Fitment: Universal For , form caliber adapter ring, it can be installed in front of the lens to achieve different diameter share the same lens diameter filter, hood, additional lens or other accessories to achieve the purpose of increasing the lens diameter. durable; small-diameter outer thread (connection end of the lens), a -diameter internal thread (take a variety of the same caliber filters 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 corners of the problem; Ring is a small to big conversion caliber adapter ring. colour: Black Material: Aluminum alloy size: 37mm-49mm,49mm-52mm,52-55mm,55-58mm,58-62mm,62-67mm,67-72mm,72-77mm,77mm-82mm,82mm-77mm,77mm-72mm,72mm-67mm,67mm-62mm,62mm-58mm,58mm-55mm,55mm-52mm,52mm-49mm,49mm-37mm Package Contents: 18 x Lens Filter Ring Adapter Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.