The Rob Roberts T3 Triple Threat Invector 20 Gauge choke is designed for those who demand precision and reliability at extended ranges. Whether you're targeting high-flying game or challenging trap targets this choke delivers exceptional performance. Constructed from durable 17-4 PH stainless steel it is compatible with steel exotic non-toxic or lead shot. Years of product development and advanced technology have culminated in a choke that redefines shooting accuracy and consistency.