The Carlson's Choke Tubes 11627 Cremator Browning Invector Plus 12 Gauge Long Range Non-Ported 17-4 Stainless Steel delivers the brands innovative Triple Shot Technology (TST), featuring three graduated rings in the taper that create a gradual transition from bore to final constriction for reduced pellet deformation, fewer flyers, and tighter, more dense patterns across all waterfowl seasons. Built in 17-4 stainless steel and non-ported, this long range choke tube offers a 25 percent longer parallel section for enhanced pattern density while maintaining extended, wrench-less installation and quick removal that also helps protect the muzzle. Designed for Invector-Plus Browning platforms, it provides reliable performance with steel, lead, and non-toxic loads in the long range constriction, with a .715 constriction diameter suitable for demanding shot placement at extended distances. The Cremator series is noted for having no size or speed restrictions with steel shot in any of its constrictions, making it a versatile choice for varied field conditions and waterfowl tactics. Note: Optima HP and Remington Pro Bore Long Range cannot be used with steel larger than #2. Made in the USA.