The Beretta USA MobilChoke choke tube delivers reliable performance for 20 gauge shotguns with Improved Cylinder constriction and durable steel construction.Beretta USA MobilChoke System - Model JCTUBE2420 Gauge with Improved Cylinder (.062" constriction diameter)Flush mount design for streamlined profileSteel construction with silver finishApproved for steel lead and non-toxic shotRecommended for 50+ yard shooting distancesIdeal for upland bird hunting and sporting clays this flush-mount choke tube provides consistent patterns while maintaining the sleek appearance of your Beretta shotgun barrel.