Carlson's Cremator 12ga Remington Non-Ported Choke Tube - The Carlson's Choke Tubes Non-Ported Waterfowl Choke Tube for 12 gauge Remington are manufactured with a one-piece, full-length steel barrel extension that is designed to work with a Remington 12 gauge shotgun. This Choke Tubes by Carlson's Choke Tubes is manufactured with a 'Twister' style constriction and can be used with lead, Hevi-Shot, and Bismuth loads. The Carlson's Waterfowl Choke Tubes has a 25% longer parallel section for tighter and more dense patterns. This Carlson's Choke Tubes Three-Pack designed to be wrench-less with easy installation and removal and features a lifetime warranty. The Carlson's Choke Tubes 12 Gauge Non-Ported Waterfowl Choke Tube is manufactured with a heat-treated stainless steel and comes with a lifetime warranty. Features For use with lead, steel, Hevi-Shot, and Bismuth loads; Extended and blued finish;