The ar15 brush combo contains the critical components you need to keep your ar15 chamber and bore carbon free.It contains a star chamber brush and star chamber mop for cleaning inside the hard to reach star chamber.Star chamber pads help collect left-over carbon while applying the perfect amount of oil or solvent.The.223/5.56mm bore brush scrubs baked on carbon from lands and grooves.Thread Pattern: 8-32"Quantity: 4 Per PackProtects: Against Copper Build Up/Fouling