Browning Diana Grade choke tubes produce tighter patterns than Browning Invector Plus choke tubes.

Specifications and Features:
Longer choke taper inside Invector-Plus choke tubes for back bored barrels
Stainless steel bar stock is heat treated prior to machining
Titanium nitride surface 72HRC hardness for excellent wear and reduced plastic build-up
Absolutely perfect concentricity for superior patterning
Extends beyond the barrel for easy removal and installation
Browning Diana Grade choke tubes produce tighter patterns than Browning Invector-Plus choke tubes