Flush mount, stainless steel tubes available for the many shotguns using the popular Win-Choke thread size and standard Beretta/Benelli. These tubes can be used with magnum and steel shot loads. Tru-Choke Thinwall tubes are recommended for 2¾" Lead Shot loads ONLY. All X-Full and Turkey constrictions are for use with Lead and Hevi-Shot ONLY! Mfg: Carlsons SPECS: 1704 Stainless steel, heat treated. Available for 20 gauge. Beretta/Benelli: .810"-1mm fits Beretta and Benelli M1 and Super 90.