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 1.60" 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; Includes M-LOK Steel Locking Nuts, Screws, and Allen Wrench; No Gunsmithing Required