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This fiber optic sight is easy to install and highly visible in all lighting conditions because of its magnetic attachment. It comes with four different bases that can be mounted on a variety of ventilated ribs. The polymer base snaps onto the rib and is held firmly in place with a magnet, making screw installation unnecessary. The sight package includes four interchangeable fiber optic rods in red, green, yellow, and amber. The base has a notch that aligns with the factory bead, enabling correct sight placement along the bore axis. Additionally, two sets of magnets are provided for mounting sights on two shotguns with different rib widths. This universal sight fits all shotguns equipped with ventilated ribs measuring ¼", 5/16", 3/8", or ½" wide. One base of each size is included in the package.