Carlson’s Cremator Choke Tubes feature our new Triple Shot Technology and is offered in close mid and long range constrictions. TST is a series of three graduated rings in the taper section of the choke tube that allow a more gradual transition from the shotgun bore to the final constriction. The Cremator offers reduced pellet deformation less flyers more dense patterns wrench-less installation quick removal and muzzle protection. Made in the USA. *NOTE- Optima HP and Remington Pro Bore Long Range cannot be used with any steel shot larger than #2.