The Burris Xtreme Tactical Signature Rings are designed with the tactical shooter in mind. While delivering ample holding power the Xtreme Tactical Rings are lighter than most rings. For the added strength without weight the Burris Xtreme Tactical Signature Rings deliver great performance. Set of 2 Rings.Each ring set includes one set of the +/- 0 MOA concentric, one set each of the +/-5 MOA and +/-10 MOA, and two sets of the +/-20 MOA. With these inserts, it is possible to make 0, 5, 10, 15, 20, 25, 30 or 40 MOA of cant in the scope mount.FeaturesUnique, self-centering, dual clamps with full cross-through connection assure proper center on any width Picatinny rail, while adding extra strengthRevolutionary Pos-Align Inserts technology, in a tactical ring configuration Pos-Align Inserts guarantee perfect centering and maximum scope-to-ring contact for tremendous gripping power without damaging the scope finish Lets you virtually sight in your gun without moving the scope adjustm...