This Breakthrough Clean Technologies Nylon Bore Brush for .357 / .38 caliber and 9mm is made in the USA and features a durable brass core with stiff nylon bristles designed to effectively remove heavy carbon buildup from firearms. It includes a #8-32 thread for compatibility with standard cleaning rods and is sized to fit the barrel properly for efficient cleaning. The nylon bristles provide thorough cleaning without scratching or damaging the bore, while the strong construction ensures long-lasting performance with bristles that won’t loosen or fall out over time. Compact and versatile, it is a practical addition to any rifle or handgun cleaning kit and can be easily stored in a range bag alongside other firearm maintenance tools and accessories.