The choke tube is made of 1704 stainless steel, heat treated for durability, and is compatible with 12 gauge Beretta/Benelli shotguns.
It is designed for flush mounting and can be used with magnum and steel shot loads, but X-Full and Turkey constrictions should only be used with Lead and Hevi-Shot.
This Improved Cylinder choke tube is part of the Mobilchoke style and is not recommended for more than 2¾" Lead Shot loads.