Burris Rimfire and Airgun Rings are the highest quality available. They are known in the industry for reliable performance under any conditions. Aluminum rings create lightweight mounting solutions .22 Ring pairs (fit .22 inch-pattern and mm-pattern grooved receivers) Use with rimfire and airgun optics Durable with strong gripping power 1-in. size Time-tested proven design Most models come with reversible clamps to also fit 11mm dovetails Covered by the unconditional Burris Forever Warranty