Most mossberg shotguns come with screw-in choke tubes, but many shooters like to add to the standard tubes or need replacements.Mossberg offers such a wide selection from skeet to turkey tubes.Accu-mag choke tubes handle lead, steel and all other non-toxic loads.Each choke tube is marked with a shot patterning designation as a guide.Patterns can vary depending on ammunition brand, load, and shot size.Approved: Lead OnlyType: ExtendedGauge: 20 GaugeConstriction Type: Extra FullConfiguration: X-FactorFinish: BlackConstrictiondiameter: .045Chokes Included: 1Recommended For: 45+ ydsMaterial: 17-4 Stainless SteelPorted: Yes