Burris Xtreme Tactical Signature Rings 34mm 1 in. Height Pair XTR Signature Rings were designed for the tactical shooter. They deliver plenty of holding power, with less weight. Black Unique, self-centering, dual steel clamps with full cross-through connection assure proper center on any width Picatinny rail, while adding extra strength 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 Rugged, robust aluminum tactical rings save weight and mount on any Picatinny and most Weaver style rails Corrects misalignment caused by off-center receiver holes Manufacturer: Burris Model: 420210