The Butler Creek Shotgun Plug fits most 12, 16 and 20 gauge pump and automatic shotguns chambered for 2-1/2", 2-3/4" or 3" shells. It can be cut to the desired length to limit the magazine capacity to 2 rounds. The durable plastic will not collect moisture and possibly rust your gun like wooden plugs.FeaturesOverall length of 6.40 inches; can be cut to fit shorter lengthsHead diameter of .60 inches