Leapers, Inc. - UTG M-LOK Offset Flashlight Ring Mount, Low Profile, Comes with Two Inserts to fit 27mm, 25.4mm (1"), or 20mm, Flashlight Tube Diameters, Black Finish, Includes M-LOK Steel Locking Nuts, Screws, and Allen Wrench for Simple and User Friendly Installation, No Gunsmithing Required RG-FL27MC