Professional's choice nylon bore brushes are the highest quality brushes offered on the market. Our nylon bore brushes will not scratch or harm the bore in any way and they are not affected by ammonia based solvents. They are specifically designed for the shooter who wants to maintain accuracy and cleanliness while not sacrificing on durability. Our nylon bore brushes are made with a highly durable galvanized steel core for strength and rigidity. Nylon bore brushes are manufactured significantly larger than bore diameter to fit your barrel properly and have a closed loop on the end and have extremely stiff, heavy bristles which provide excellent scrubbing action in your rifle's bore. Our professional's choice nylon bore brush is fitted for 6.5 mm with a 832 thread double wound bristles.