Carlson'sA(R) Extended Turkey Choke Tubes deliver extra-tight patterns for maximum lethality at extended ranges. Manufactured from fine 17-4 heat-treated stainless, these are a gobbler's worst nightmare. PLEASE NOTE: No steel shot larger than #4 may be used in Carlson's Turkey Choke Tubes. For 12-gauge only. Details: For 12-gauge shotguns Made from 17-4 heat-treated stainless Can be used with any lead or Hevi-Shot load Capable of withstanding heavy buffered turkey shot Extends about 1" from the end of the barrel Made in the USA Backed by a lifetime mfr. warranty Order today!