Ultimate Arms Gear 1" Inch Tube Aluminum Flat Top Base One Piece Cantilever Dual Double Gun Scope Ring Offset 3/8" Dovetail Mount, For Red Dot Sights, Optics, Airsoft Air Gun Paintball One-Piece, Aluminum Rings Is Precision Machined to True Specs for A Secure Fit on Flattop. Easily Attaches and Detaches with Nut. Will fit 1" Inch Scope Tubes. 4 Steel Screws Secure the Top of Each Ring Strap to Hold the Optics Tight Under Heavy Recoil. Dovetail 3/8" (10/11mm) Mount Easy Installation.