Unique, self-centering, dual steel clamps with full cross-through connection assure proper center on any width Picatinny rail, while adding extra strength. Burris XTR rings ONLY fit a Picatinny style rail. 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 thous Mfg: Burris
