The Rob Roberts Final Strut Rem Choke for 20 Gauge shotguns is a precision-engineered choke tube designed to enhance shooting performance. With a constriction diameter of .570 it is optimized for use with bismuth shot ensuring superior results when paired with the RRaptor BIZ choke. Crafted from 174 PH U.S. Stainless Steel this choke boasts durability and reliability born from years of meticulous product development and innovation. It is a part of the esteemed RRaptor Series known for its advanced technology and exceptional performance. Ideal for hunters seeking consistent and reliable shot patterns this choke is a valuable addition to any shotgun setup.