HIVIZ Combo Pack, Front and Rear Sights (Fits Shotguns with Vent Ribs 21/64" - 7/16") Hi-Viz combo pack Fully adjustable front and rear sight Fits vent ribs 21/64" to 7/16" Shoot Better with bright sights Great for turkey, deer and waterfowl Front and rear combo shotgun sight Front is magnetic base fitting ribs .328 inches to .437 inches with 1 orange and 1 green LitePipe available. Rear sight is two dot green LitePipes adjustable for windage and elevation Fits Winchester Mossberg and Remington SP10 HiViz recommends gunsmith installation for all dovetail sights. Due to manufacturing tolerances, some firearms may require additional fitting.