The Fenix ALG-16 Rail Mount, is a great solution for mounting a flashlight to a rifle with a Multi Rail Mount System guide rail. The quick release roller allows you to mount a flashlight for a secure fit. Made of hard-anodized aluminum, the Fenix ALG-16 Rail Mount is strong and lightweight-perfect for harsh conditions where durability counts. Features : Mounts to MLOK Rails "Adjustable Diameter Allows you to use Any Flashlight that is 0.925"-1.02"" Anodized Finish