Introducing the Fenix Flashlight Ring Mount. The Fenix Flashlight Mount is a quick-release mount which features an anti-slip inner rubber ring. With the new adjustable diameter design, you will be able to mount many different sizes of lights. This design is perfect for your picatinny rail. Kit Includes:ALG-OO Flashlight Ring, Allen Wrench, and two Spare Rubber Cushions FeaturesQuick Rail ClipAdjustable Diameter Design to Fit Multiple FlashlightsAdjustable from 22.5-26mmPrecision Machined Aluminum Anti-skid Rubber Cushion