Professional nylon rifle bore brushes designed specifically for .37 caliber firearms with 8-32M threading. This 12-pack provides long-lasting cleaning performance for proper firearm maintenance.Nylon Rifle Bore Brush Set - 12 Pack.37 caliber specific sizing for optimal cleaning8-32M thread compatibility with standard cleaning rodsDurable nylon bristles for effective bore cleaningBulk pack for extended use and valueEssential for rifle maintenance and cleaning routines these nylon brushes effectively remove fouling and debris while being gentle on barrel rifling.