Professional nylon rifle bore brushes designed specifically for .338 caliber firearms with 8-32M threading for effective barrel cleaning and maintenance.Nylon Rifle Bore Brush Set - 12 Pack.338 caliber bore diameter8-32M standard thread compatibilityDurable nylon bristles for safe cleaningDozen pack for extended useEssential cleaning tools for maintaining accuracy and extending barrel life of .338 caliber rifles. Compatible with standard cleaning rods featuring 8-32M threading.