This premium tool is used to remove the barrel nut for further servicing, cleaning and maintenance. It is critical to use a proper fitting tool to remove the barrel nut to ensure they do not get rounded or damaged, leading to additional difficulty. Some aftermarket barrel nuts are not made to proper spec, so we cannot guarantee fitment. We recommend using a penetrating oil and heat for removal the first time. DO NOT beat or hammer on this wrench. The wrench is designed to fit very snug onto the barrel nut. Sometimes it may need a few soft taps with a soft face mallet to fully seat onto the barrel nut, this is common. Note: 1x Wrench Per Purchase. Some Wrenches may have mild spots of natural discoleration.