Carlson's Choke Tubes Cremator for Winchester 20 Gauge incorporates innovative Triple Shot Technology (TST) to enhance shooting performance. This choke tube is designed with a mid/long range ported configuration, allowing for a more gradual transition from the shotgun bore to the final constriction. The TST features three graduated rings in the taper section, which helps minimize pellet deformation, reduce flyers, and create denser shot patterns.Key FeaturesChokes Included: Comes with 2 chokes for versatile shooting options.Material: Constructed from 17-4 stainless steel for durability and corrosion resistance.Wrench-less Installation: Easy to install and remove without the need for a wrench.Made in the USA. *NOTE- Optima HP and Remington Pro Bore Long Range cannot be used with any steel shot larger than #2.