Carlson's Cremator choke tubes are designed with triple shot technology (TST). TST features three graduated rings in the taper section of the choke tube, providing a smoother transition from the shotgun bore to the final constriction. This innovative design reduces pellet deformation, minimizes flyers and results in more dense patterns. These advantages make the Cremator series especially effective for waterfowl hunting across the entire season. The series works with steel shot of any size or speed, regardless of the constriction chosen. Additionally, these extended choke tubes offer a 25% longer parallel section for tighter, denser patterns, along with the benefits of wrench less installation, quick removal and muzzle protection. Available in both ported and non ported configurations, Cremator choke tubes are precision machined from heat treated 17-4 stainless steel and made in the USA.