HIVIZ Narrow Magnetic Fiber Optic Shotgun Sight with Red Light Pipe Hi-Viz Magnetic shotgun sights Fits vent ribs 7/32" to 21/64" Helps you shoot better Great for all shotgun gauges Easy to install with magnetics Magnetic base sight to fit ventilated shotgun ribs from .218 inches to .328 inches Includes one red lite pipe Fits remington field models browning gold 10GA BPS auto5 berretta Comp T and ST ribs Due to manufacturing tolerances, some firearms may require additional fitting