Quick Detach Picatinny Scope Ring (20mm Weaver Rail,high Profile, 30mmto 1 Inch Diam, 4-screw) Fits all scopes with a 30mm/25.4mm body tube Robust and User Friendly Ergonomic Quick Detach/Lock Lever Mount, Fully Adjustable to Fit on Any Weaver / Picatinny Rail (20mm) Precision Machined From Aircraft-grade Aluminum Alloy with Anodized Black Matte Finish Ring Diameter: 25.4mm/30mm adjustable