Primary Arms Low 30mm Tactical Rings place the center of your 30mm tube scope 0.84 inches above your 1913 Picatinny rail or Weaver rail platform. Two rings are included, each held together by six Torx head screws. Constructed of high quality aluminum with a matte black anodized finish, these rings feature a 1-year warranty. To purchase a single ring, see product code PATR30LS.