Factory Browning Invector Plus 20 Gauge Modified Choke Tube. - Longer choke taper inside Invector-Plus choke tubes for use with back-bored barrels. - Produces excellent patterns with excellent uniform densities. - All Browning tubes are set to industry constriction standards. - Flush fit does not extend beyond end of barrel. - Constructed of highly polished, 17-4 stainless steel for the ultimate in performance and durability. Specs: Material: 17-4 Stainless Steel Color: Stainless Steel Pockets: Stainless Choke Gauge: 20 Choke Pattern Percentage: 35% - 65% Choke Notches: 3 Weight: 4.8 Ounces This is a manufacturer's picture, so the item may not be exactly as it appears in the picture.