Monstrum Tactical Cantilever Dual Ring Scope Mount, Offset Design, with Top Rails for 30mm or 1" Scopes Scope mount for mounting standard 30mm or 1 inch tube rifle scopes Mounts to any flat top Picatinny or Weaver rail equipped rifle 3 inches of forward extension allows extra flexibility for optimum eye relief and shooting position Optional 1" scope ring inserts can be used inside the scope rings, allowing for perfect fit mounting of 1" scope tubes Integrated Picatinny top rails allow for mounting of red dot, optics or additional accessories