The Rob Roberts Final Strut Optima HP 12 GA choke is engineered for superior performance and precision. Designed specifically for 12-gauge shotguns this choke features a constriction diameter of .655 making it ideal for various hunting scenarios. Crafted from high-quality 174 PH U.S. Stainless Steel it ensures durability and reliability in the field. This choke excels when paired with bismuth shot shells enhancing your shooting experience. Part of the renowned RRaptor Series it incorporates cutting-edge technology and years of innovation offering a significant upgrade to your shotgun's performance. Note that this choke is designed for use in a single barrel only maximizing its effectiveness and efficiency.