Carlsons 17639 Extended Turkey Retay 17-4 Stainless Steel Black Carlson's Extended Turkey Choke Extend approximately 1" From The End Of The Barrel. It Is manufactured From 17-4 Heat Treated Stainless Steel To Withstand Heavy Buffered Turkey Shotshells. It Also produces Extra Tight patterns With Copper Plated And Buffered Lead Turkey shotshells. Constriction Type: Turkey Configuration: Retay Finish: Black Constriction: .665 Chokes Included: 1 Material: 17-4 Stainless Steel