Detail Information: Precision Machined From Aircraft-grade Aluminum Alloy with Anodized Black Matte Finish Patented, Innovative Flip-to-Side Design Allows Target Acquisition at Varying Distances and Flexible Position of Accessory Fits Magnifiers or Other Accessories with 30mm Tube Diameter Complete with 2 Inserts to Use with a Wide Range of Flashlights or Other Accessories with 30mm, 27mm or 1" Diameter Picatinny/Weaver Compatible Mounting Base with Patented Quick-detach Lever Lock for Rapid and Secure Installation 40mm Center Height Ensures Compatibility with Many Popular Dot Sights Material: Aluminum Weight: 1.9 oz Pieces: 1 Rail Type: Picatinny/Weaver Profile Level: High Ring Diameter: 30 Ring Width: 22 mm Screws Per Ring: 4