Primary Arms 30MM Tactical Ring - Extra High (Single Ring) - PATR30EXS USE: The extra high tactical ring places the center of the 30mm tube scope 1.59 inches above the rail. ONE TACTICAL RING: Please note this listing is for a single 30mm tactical ring. To purchase a pair, see product code PATR30EXP. DURABILITY: Constructed of high quality aluminum with a matte black anodized finish. PLATFORM: For use on 1913 Picatinny rails or Weaver rail platforms. 1-YEAR WARRANTY: If a defect due to materials, workmanship, or normal wear and tear has caused your product to malfunction, Primary Arms will either repair or replace.