Efficient Cleaning: The dual diameter chamber cleaning brush is designed for 7.62mm/.308 caliber, providing a simple and effective cleaning experience. Thorough Scrubbing: The tapered bronze bristles are perfect for scrubbing the chamber, neck and shoulder of your gun for a thorough clean. Durable Construction: The brass shank is cold welded to the core and the tip is looped, providing a solid and reliable construction for long-term use. STANDARD THREADS: With standard 8-32 threads, this bronze chamber brush is compatible with most cleaning wands and accessories. ECO-FRIENDLY: The pack of 10 bronze bore brushes ensures you have enough brushes to clean all your firearms, reducing waste and promoting environmental friendliness.