Tri-rail mount for adding Picatinny rails to a rifle or shotgun that does not have a rail. Easily clamps on any barrel, from 12mm to 24mm diameter. Includes 12 different length screws to adapt the mount to the barrel diameter. Fits anything from a 10/22 to 870. The perfect way to add sections of picatinny rail to any rifle that does not come with factory rails.
40mm long (front to back), 55mm wide (two rail sides), height will depend upon what diameter barrel it is mounted on