Aircraft Grade Aluminum Construction with a Matte Black Anodize Finish Low Profile, Compact, and Lightweight 3.47" in Length and weighs only 3 oz. Removable Offset Mount Provides 1.83" Forward or Rearward Offset in addition to the Flashlight Ring's 1.12" Vertical or Downward Offset Comes with 2 Polymer Inserts to Accept 27mm, 25.4mm (1"), or 20mm Flashlight Tube Diameters Adaptable Orientation of Flashlight Ring Allows for Increased Compatibility Across More Firearms, Handguards, Front Sights, etc. Includes Keymod Steel Locking Nuts, Screws, and Allen Wrench for Simple and User Friendly Installation, No Gunsmithing Required