AR-308 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 of .308/7.62 rifles. This quick-clean tool serves four purposes- Scrapes carbon and fouling from the: Bolt Bolt Carrier Firing Pin Includes a 8-32 threaded hole to act as a T-handle Note: While this tool fits many bolts flawlessly, it may fit some bolts better than others due to variance in bolts by different manufacturers. Mfg: Otis