The Primary Arms Low 30mm Tactical Ring places the center of your 30mm tube scope 0.84 inches above your 1913 Picatinny rail or Weaver rail platform. One ring is included, held together by six Torx head screws. Constructed of high quality aluminum with a matte black anodized finish, these rings feature a lifetime warranty. To purchase a pair of these rings, see product code PATR30LP.