Carlson''s Beretta/Benelli Mobil Extended Turkey Choke Tube is manufactured from 17-4 heat treated stainless steel to withstand heavy buffered Turkey shotshells. It produces extra tight patterns with copper plated and buffered lead turkey shotshells. The Extended Turkey Chokes extend approximately 1" from the end of the barrel and has a 1.050" parallel section to produce the optimum pattern with your shotgun. This model has a black finish and a .665 diameter. NOTE: It should not be used with steel shot.