For use with Hevi-Shot, Bismuth or lead, this high performance choke tube has been specifically designed for the coyote hunter to deliver devastating downrange patterns upwards of 70 yards when shooting larger shot sizes. Produces very dense patterns when ultilizing T and #4 Buckshot loads. Great for waterfowl and predator hunting.Specifications and Features: Carlsons Choke Tubes are made in the U.S.A., carry a lifetime warranty and are precision-machined from heat-treated 17-4 stainless steel.