Manufacturer: Carlson's 00066
For Use With: Remington Model 1100, 11-87, Pro Bore Guns, G-3 models, Beretta Shotguns, Winchester Shotguns, Franchi Shotguns, Charles Daly Shotguns, Tri Star Shotguns, EAA Shotguns, and many other shotguns that use a gas o-ring. For 12ga., 20ga. or 28ga. (20 Gauge will fit 28 Gauge). Graphite Coated for Long Lasting Performance.
Six Rings: Two 20 Gauge, Four 12 Gauge