Features: Precision CNC Machined from 6061-T6 Aluminum and Finished in a Matte Black Anodization Lightening Cuts Reduce Overall Weight Without Compromising Durability All Sharp Edges and Corners Removed and Radiused Quick Release (QR) Mount Features Tool-free Tension Adjustment, Locking Quick Release Lever, and Squared Recoil Stops for a Secure Zero Hold and Return to Zero 15mm Saddle Height, 30mm Center Height, Fits 30mm Tube Optics with an Objective Outer Diameter up to 60mm