Carlson's ported bone Collector Turkey Choke Tubes offer a highly effective and rigorously tested constriction that delivers exceptionally tight patterns when using various shotshell types for Turkey hunting, such as lead, nickel-plated, copper-plated, Bismuth, Hevi-Shot, tungsten, and TSS. The extended taper section of the constriction ensures minimal flyer pellets and maximizes the concentration of pellets on the target, enhancing accuracy. Crafted with precision from 17-4 heat treated stainless steel, these Choke Tubes feature a discreet matte black finish to prevent reflections. Each Choke Tube's constriction has undergone meticulous pattern testing and has demonstrated superior patterns when using shot sizes from 4 to 10. For larger shot sizes, it's recommended to opt for a more open Choke Tube to optimize pattern performance. It's crucial to pattern your shotgun Choke Tube with the specific shot shell load you intend to use, as different ammunition types and brands can yield varying patterns from the same Choke Tube. Please avoid using steel shot larger than #4, slugs, sabots, rifled slugs, or 00/000 buckshot with Carlson's Turkey Choke for optimal safety and performance.