Professional nylon pistol bore brushes designed for effective cleaning of 10mm 40 caliber and 41 caliber handguns with 8-32 male threading.Nylon Pistol Bore Brush - 12 PackCompatible with 10mm 40 caliber and 41 caliber pistols8-32 male thread for secure attachmentDurable nylon bristles for gentle yet effective cleaningDozen pack provides excellent valueEssential for proper firearm maintenance these nylon brushes effectively remove fouling and debris while being gentle on barrel rifling ensuring optimal accuracy and firearm longevity.