TruGlo Magnum Gobble Dot Pro Series Sight 8mm Fits Most Benelli Super Black Eagle/M1/Nova, Browning BPS, Ruger Red Label, Stoger Model 2000, and Savage Models - TG944DAll-steel construction. Securely mounts to your rib without tape or magnets. Full windage and elevation adjustment. Front diameter is .029 inch, rear diameter is .035 inchThis is a manufacturer's picture, so the item may not be exactly as it is shown in the picture.