These Carlson's Cremator Chokes feature brand new Triple Shot Technology. TST is a series of three graduated rings in the parallel section of the choke, that allow a more gradual transition from the shotgun bore to the final constriction that conveys a host of benefits to the shooter, like reduced pellet deformation, a shortened shot string, and less flyers. You also get all the benefits of an extended choke tube, including a 25% longer parallel section for tighter and more dense patterns, wrench-less installation and quick removal, and muzzle protection. The chokes extend 3/4" outside the barrel eliminating damage to your barrel caused by prolonged use with steel shot. Like all Carlson's tubes, the Cremator series carries a lifetime warranty, and are constructed out of our premium 17-4 stainless steel. Combine the spectacular performance of today's premium ammunition with this breakthrough in choke tube technology and you'll see why Carlson's new Cremator series of choke tubes is s...