Burris Signature Rings have a reputation for reliable performance in any weather or shooting circumstance. Pos-Align Inserts offer tremendous gripping power and durability without damaging the scope finish, and corrects misalignment caused by off-center receiver holes, bases, or rings. These solid steel rings are ideal for hunting. These Signature rings have 30mm diameter, a high mount height, universal dovetail, and a matte black finish. They come with "zero" inserts and +/- 0.10 inserts for both front and rear rings.Burris Signature rings set the industry standard for quality. They have a reputation for reliable performance in any weather or shooting circumstance. Features: Solid steel rings, ideal for hunting Pos-align inserts offer tremendous gripping power and durability and will not damage the scope finish Works with standard, dovetail, double-dovetail, and Weaver-style bases Proven design has stood the test of time Covered by the Burris forever warranty Virtually sight in your gun without moving the scope adjustments Corrects any misalignment caused by receiver holes drilled off-center Corrects for bases or rings being slightly off center Makes expensive tapered bases or shimming for 1000 yd shooting a thing of the past