Start of lstUrls_of_images_in_html_description Product Number: 11310 Browning’s premium extended choke tubes for your Invector Plus shotgun, featuring tactile gripping surfaces, easy to read caps, and super durable Titanium Nitride coating for long lasting corrosion resistant performance. Features Longer choke taper inside Invector-Plus choke tubes for use with back-bored barrels on 20 gauge shotguns Stainless steel barstock is heat treated prior to machining Titanium nitride surface 72HRC hardness for excellent wear and reduced plastic buildup Absolutely perfect concentricity for superior patterning Extends beyond the barrel for easy removal and installation Specifications Material: 17-4 Stainless Steel Colour: Titanium Nitride Gauge: 20 Weight (average): 4.8 oz Sizes Skeet – 0.005\