Height: 1 – Size: 1 – New 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 Weaver or Picatinny-style rail – Each ring set includes two sets of concentric inserts and one set each of the following offset inserts: +/-5 MOA +/-10 MOA +/-20 MOA