SONIC GUN CARE 223 Rifle Bore Brush Our Precision Designed Red Brushes Are Made With Extremely High-Quality Stiff Nylon. Nylon Brushes Are Safe But Yet Very Effective For Cleaning Even On Some Of The Toughest Cleaning Jobs. Solvent Resistant. Brushes Come Packaged In A Clam Shell, Great For Storage 8-32 Threaded. Fits The Following Calibers: .22 .223 5.56 MADE IN AMERICA.