Burris' Signature Zee Rings sets the standard for quality. They are made of solid steel, ideal for hunting, and work with Weaver-style bases.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