The 17 Caliber 5-40M Copper Eliminator Bore Brush is specifically designed for effective cleaning of 17 caliber firearms with 5-40M threading.17 Caliber 5-40M Bore Brush 3-PackCopper eliminator design for enhanced cleaning performance5-40M thread compatibilityConvenient 3-pack quantitySKU: B-17PNA UPC: 608060000291Essential for maintaining accuracy and performance of 17 caliber firearms by effectively removing copper fouling and debris from the barrel bore.