Browning Diana Extended Titanium Black Band Choke Tube Spreader 12 Gauge Helically Rifled. The Browning choke tubes have a titanium nitride surface 72HRC hardness for excellent wear and reduced plastic build-up and have absolutely perfect concentricity for superior patterning. Available Optiopns for Browning Diana Grade Extended Choke Tubes 1130513: Browning Diana Grade Extended Choke Tube Titanium Nitride black band - Cylinder 12 Gauge Constriction .000 1130533: Browning Diana Grade Extended Choke Tube Titanium Nitride black band - Light Modified 12 Gauge Constriction .015 1130553: Browning Diana Grade Extended Choke Tube Titanium Nitride black band - Full 12 Gauge Constriction .035 1130563: Browning Diana Grade Extended Choke Tube Titanium Nitride black band - Improved Modified 12 Gauge Constriction .025 1130573: Browning Diana Grade Extended Choke Tube Titanium Nitride black band - Modified 12 Gauge Constriction .020 1130583: Browning Diana Grade Extended Choke Tube Titanium Nitride black band - Improved Cylinder 12 Gauge Constriction .010 1130593: Browning Diana Grade Extended Choke Tube Titanium Nitride black band - Skeet 12 Gauge Constriction .005 1131033: Browning Diana Grade Extended Choke Tube Titanium Nitride black band - Light Modifiedm 20 Gauge Constriction .015 1131053: Browning Diana Grade Extended Choke Tube Titanium Nitride black band - Full 20 Gauge Constriction .035 1131063: Browning Diana Grade Extended Choke Tube Titanium Nitride black band - Improved Modified 20 Gauge Constriction .025 1131073: Browning Diana Grade Extended Choke Tube Titanium Nitride black band - Modified 20 Gauge Constriction .020 1131083: Browning Diana Grade Extended Choke Tube Titanium Nitride black band - Improved Cylinder 20 Gauge Constriction .010 1131093: Browning Diana Grade Extended Choke Tube Titanium Nitride black band - Skeet 20 Gauge Constriction .005 1132133: Browning Diana Grade Extended Choke Tube Titanium Nitride black band - Light Modified 28 Gauge Constriction .015 1132153: Browning Diana Grade Extended Choke Tube Titanium Nitride black band - Full 28 Gauge Constriction .035 1132163: Browning Diana Grade Extended Choke Tube Titanium Nitride black band - Improved Modified 28 Gauge Constriction .025 1132173: Browning Diana Grade Extended Choke Tube Titanium Nitride black band - Modified 28 Gauge Constriction .020 1132183: Browning Diana Grade Extended Choke Tube Titanium Nitride black band - Improved Cylinder 28 Gauge Constriction .010 1132193: Browning Diana Grade Extended Choke Tube Titanium Nitride black band - Skeet 28 Gauge Constriction .005 1130503: Browning Diana Grade Extended Choke Tube Titanium Nitride black band - Spreader 12 Gauge Constriction Helically rifled to spin Specifications for Browning Diana Grade Extended Choke Tube: Manufacturer: Browning Color: Black/Stainless Steel Finish: Titanium Nitride Fabric/Material: Stainless Steel Gun Make: Browning Quantity: 1 Condition: New Features of Browning Diana Grade Extended Choke Tubes Stainless steel barstock 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 Longer choke taper inside Invector-Plus choke tubes for use with back-bored barrels. Package Content Browning Diana Grade Extended Choke Tubes Browning Diana Extended Titanium Black Band Choke Tube Spreader 12 Gauge Helically Rifled