Features: Unique and self-centering and dual steel clamps with full cross-through connection assure proper center on any width Picatinny rail and while adding extra strength Revolutionary Pos-Align Inserts technology and 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 and robust aluminum tactical rings save weight and mount on any Picatinny-style rail The Burris Xtreme Tactical Signiture 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. Technical Information: Ring Height: High: 1.25"