20 gauge Standard Invector offer top performance, exceptional patterns, and superior durability. Choose from a full selection of 20 gauge Standard Invector choke constrictions. Fits Standard Invector barrels only. 20 gauge Standard Invector tubes are available in constrictions ranging from cylinder to full. They produce excellent patterns with excellent uniform densities. All Browning Invector tubes are set to industry constriction standards. Flush fit does not extend beyond the end of the barrel. Constructed of highly polished, 17-4 stainless steel for the ultimate in performance and durability. Features: Standard invector tubes are available in constrictions ranging from cylinder to extra full Produces excellent patterns with uniform densities Made to industry constriction standards Flush fit tubes do not extend beyond end of barrel Constructed of highly polished, 17-4 stainless steel for the ultimate in performance and durability