Introducing the brand new Fenix Flashlight Ring Mount. What is new with the Fenix ALG-00 is the quick-release feature as well as the new anti-slip inner rubber ring. With this new adjustable diameter design, you will be able to mount many different sizes of lights. This new design is perfect for your picatinny rail. Features Quick Rail Clip Adjustable Diameter Design to Fit Multiple Flashlights Adjustable from 22.5-26mm (.89-1.02in) Precision Machined Aluminum with Anodized Matte Black Finish Anti-skid Rubber Cushion Measurements Length: 1.38 inches (35mm) Width: 1.81 inches (46mm) Height: 1.69 inches (43mm) Weight: 1.98 oz (56 grams)