Carlson's choke tubes are among the best in the business, and provide dependable service for a lifetime to their owners. High quality steel and tight tolerances ensure the best possible patterns in all of your shotguns. Carlson choke tubes will never let you down! Carson's new TSS Turkey Choke tubes are made to give you the best pattern with Federal Premium Heavyweight TSS Turkey loads but work well with other smaller size shot turkey loads as well, from 7 to 9. This choke tube is made to put the maximum shot in a 10" circle at 40 yards. Specifications and Features:Carlson's 38005TSS Turkey Choke Tube12 Gauge Constriction TurkeyDiameter 0.640Extended TubeExtends approximately 1" past barrelDesigned to be used in conjunction with Federal Premium Heavyweight TSS Turkey LoadWorks with all smaller shot size (7-9) turkey loadsMatte BlueFits: Winchester, Invector and Mossberg 500 SystemsNote:Not for use with steel shot