The Carlson's Cremator Choke Tube features innovative Triple Shot Technology (TST) with mid-range constriction for superior pattern performance. This ported design is precision-machined from heat-treated 17-4 stainless steel for Winchester shotguns with .715 bore diameter.Carlson's 12 Gauge Mid Range Ported Cremator Choke TubeTriple Shot Technology (TST) with three graduated rings for gradual constrictionReduces pellet deformation and flyers for denser patternsNo size or speed restrictions with steel shot25% longer parallel section for tighter patternsWrench-less installation and quick removalHeat-treated 17-4 stainless steel constructionMade in USA with lifetime warrantyCompatible with Winchester Browning Invector Mossberg 500 Weatherby Pre-1993 Ruger Red LabelIdeal for waterfowl hunting throughout the entire season this extended choke tube offers superior pattern density and muzzle protection while providing easy field installation without tools.