Burris XTR Signature Rings were designed for the tactical shooter. They deliver plenty of holding power with less weight. Unique self-centering dual steel clamps with full cross-through connection assure proper center on any width Picatinny rail while adding extra strength Revolutionary 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 adjustments Corrects misalignment caused by off-center receiver holes Corrects for bases or rings being slightly off-center No need for expensive tapered bases or shimming for thousand-yard shooting Rugged robust aluminum tactical rings save weight and mount on any Picatinny and most Weaver style rails NOTE: Each ring set includes one set of