Enhance the reliability and performance of your autoloading shotgun with Carlsons Rubber Graphite O-Ring Kit. Designed with a durable rubber and graphite coating this kit ensures long-lasting functionality and smooth operation. Perfectly suited for 12 and 20 gauge Remington Model 1100 and 1187 Pro Bore as well as G3 models it also fits a wide range of Beretta Winchester Franchi Tri Star and EAA shotguns. Additionally the 20 gauge rings are compatible with most 28 gauge models providing versatile solutions for avid shooters. The sleek black and silver finish adds a touch of style to your firearm maintenance routine.