Feature: Universal ND filter adapter ring, compatible with most wide angle lens and prime lens and zoom lens, suitable for indoor and outdoor shooting. After installing the rapid filter system, you can easily engage or disengage the filter on your demand. There are several diameters for you to choose from: 49mm / 58mm / 67mm / 72mm / 77mm / 82mm, to fit for different filter size. Made of aluminum alloy CNC technology, not easy to deform, solid and durable. The filter cover can be rotated,o as not to block the use of other accessories. The filter frame fits tightly to the ring holder, preventing from light leakage and effectively reducing the light exposure. Specification: Model: R-49 / R-58 / R-67 / R-72 / R-77 / R-82 (optional) Material: Aluminum Alloy Diameter: 49mm / 58mm / 67mm / 72mm / 77mm / 82mm (optional) Packing List: 1 * Filter Adapter Ring