Burris 30mm Zee Rings Medium Black Matte Signature rings are for the shooter who demands the best performance from his equipment and is a practical thinker. The benefits of this revolutionary design are many. Consistent accuracy. Tremendous gripping power. Scratch-free and stress-free mounting. Scope value preservation. By putting a synthetic pivoting insert within a steel outer ring your scope-to-ring surface area contact becomes virtually 100%. Burris rings and bases have long been favorites of custom gunmakers because of their strength beauty and fit.UPC: 381205889