TruGlo Tru Bead Turkey Xtreme Dual Color/Universal Turkey Sight Fits Any Rib Width - TG950XDUniversal mounting system for ventilated rib shotguns. Full windage and elevation adjustment. CNC machined. Hardware included. Front diameter is .120 inch, rear diameter is .035 inch. Rear ghost ring and notched rear sight. Dual color threaded front sightThis is a manufacturer's picture, so the item may not be exactly as it is shown in the picture.