Ledsniper1" 25.4/ 30 Mm High Ring 20mm Weaver Picatinn Rail Qd Quick Release Scope Mount Precision Machined From Aircraft-grade Aluminum Alloy with Anodized Black Matte Finish. Robust and User Friendly Ergonomic Quick Detach/Lock Lever Mount, Fully Adjustable to Fit on Any Weaver / Picatinny Rail (20mm). Tight Tolerance Control with Anti-rotation Feature to Guarantee Most Positive and Repeatable Zero and Re-zero Capability. Ring Diameter: 25.4mm/30mm adjustable t's an ideal mount for adding scope, flashlight etc to your rifle.