The b.O.N.E.Tool was designed specifically to clean the bolt carrier assembly area.This quick-clean tool serves four purposes: scrapes carbon and fouling from the bolt bolt carrier and firing pin.It includes a 8-32 threaded hole to act as a t-handle.It may fit some bolts better than others due to variance in bolts by different manufacturers.Thread Pattern: 8-32"Type: B.O.N.E. ToolSize: 223/5.56 NATOQuantity: 1Length: 5"Material: SteelProtects: Removes FoulingSuitable For: Rifles