Hi-Viz Magnetic Shotgun Sight-Wide Fits 21/64-7/16

“Hi-Viz Magnetic Shotgun Sight-Narrow, fits shotguns with vent ribs from 21/64″” to 7/16″”. Great for all shotgun gauges. Shoot better on the range or in the field with a Hi-Viz sight. Kit includes multiple tubes in red, two-tone, and green in two diameters.”