KleenBore 38/357/9mm Caliber Patch Holder Brush - KleenBore exclusive original design Patch Holder Brush works double duty to clear your bore of fouling fast! Utilizing both a patch holder and heavy duty phosphor bronze bristles, this unique combination loosens and traps stubborn fouling build-up. FEATURES: Dual Combo Design of patch holder and bore brush Loosens and traps fouling in each pass through the bore American Std. #8-32 threads Made in USA