Hoppe's ar chamber brush is designed to keep your ar bore and chamber free of residue for better accuracy and performance.The dual diameters of the chamber brush are designed specifically to fit into the chamber of ar rifles and remove hard to clean powder, lead and metal fouling easily.Fits standard cleaning rods.Thread Pattern: #8-32Type: Cleaning BrushQuantity: 10 PackBristle Type: BronzeProtects: Removes FoulingSuitable For: AR-10 Rifles