Ghost-Ring Shotgun Sights provide increased accuracy at extended ranges and fast sight acquisition up close. Sights feature windage and elevation adjustable rear sight and rear sight wings for protection in rough environments. Tritium green front post sight. Tritium insert is surrounded by a thin white line for enhanced use in daylight. Rear sight is non-tritium ghost ring sight. Sights require your shotgun to be drilled and tapped. Notes: Fits barrels with diameter between 0.860"-0.885"