The Rob Roberts Final Strut Optima HP 12 Gauge Choke is a meticulously crafted accessory designed to enhance your shooting experience. Engineered with a constriction diameter of .660 this choke is optimized for use with bismuth shot shells delivering superior performance in the field. Part of the esteemed RRaptor Series it represents years of product development and innovation. Constructed from 174 PH U.S. Stainless Steel this choke ensures durability and reliability. While it can only be used in one barrel of a shotgun its advanced design makes it a valuable addition to any shooting enthusiast's collection.