Factory Browning Standard Invector 28 Gauge Skeet Choke Tube - 1130296. Produces excellent patterns with excellent uniform densities. All Browning tubes are set to industry constriction standards. Constructed of highly polished, 17-4 stainless steel for the ultimate in performance and durability.p Specs: Material: 17-4 Stainless Steel Pockets: Stainless Choke Gauge: 28 Choke Pattern Percentage: 20% - 45% Choke Notches: 5 Weight: 4.8 Ounces This is a manufacturer's picture, so the item may not be exactly as it appears in the picture.