Genuine Browning Standard Invector flush-mount choke tube for 20 gauge shotguns, in the versatile Improved Cylinder constriction (.009″) — a good all-round choice for upland birds, skeet and closer-range targets. Machined from highly polished 17-4 stainless steel to industry constriction standards for uniform pattern densities and long service life. Fits only Browning shotguns threaded for the Standard Invector system; must not be used in barrels marked Invector-Plus or Invector-DS. UPC 023614093695.