Robust 6-screw Tactical Ring is perfect for mounting red-dot optics, magnifiers, and other accessories with 30mm tube diameters to your Picatinny rail. When using this ring to mount a conventional riflescope, we strongly recommend lapping the rings for a proper and secure fit for your optic.

The Vortex Tactical 30mm Riflescope Ring 
 Medium Height, 0.97" from base to center
Attachment/Mount Type: Picatinny