MSR/AR owners know the importance of a clean bolt and bolt carrier group. Carbon and fouling can build-up in these areas, causing jams and malfunctions. The B.O.N.E. Tool was designed specifically to clean the bolt carrier assembly area. Note- While this tool fits many bolts flawlessly, it may fit some bolts better than others due to variance in bolts by different manufacturers.FeaturesDesigned specifically to clean carbon & fouling from the bolt carrier assembly area of MSR/AR style riflesScrapes carbon and fouling from the bolt, bolt carrier and firing pinIncludes a 8-32 threaded hole to act as a T-handle