Carlsons Extended 12ga Beretta/Benelli Mobil .665 - The Extended Turkey Choke Tube extends approximately 1in from the end of the barrel. This item is manufactured from 17-4 heat treated stainless steel and has a matte blue finish. The 1.050in parallel section produces an optimum pattern with your shotgun. .665in diameter 17-4 stainless steel 1.050in parallel section to produce optimum patterns No steel shot larger than #4 Extends 1in from the end of the barrel