The Otis FG246, also known as the B.O.N.E. Tool, is a specially designed cleaning instrument explicitly meant for maintaining the bolt carrier assembly area. This efficient cleaning tool serves quadruple functions. It effortlessly scrapes off carbon and fouling from the Bolt, Bolt Carrier, and Firing Pin, ensuring your assembly is always in perfect condition. One notable feature of this model includes its 8-32 threaded hole that functions commendably as a T-handle, adding convenience and efficiency to your cleaning process. Devised to perfectly fit 5.56mm rifles, the B.O.N.E tool may also accommodate some bolts better than others. This is due to the variation in bolt designs across different manufacturers.