Brownells Standard Line Nylon Bore Brushes are designed for durability, resisting damage from aggressive copper and bronze-based bullet jacket fouling cleaners.
The brushes feature a one-piece, looped and wound steel shank for handguns, with a brass shank for the .17 and .20 caliber models.
Offered in bulk packs for convenience and cost savings, they are available with 5-40 threads for 17 caliber and 8-32 threads for other sizes.