The HOPPE'S phosphor bronze brushes was developed to function as the most suitable way to be sure that your firearm is clean and effectively maintained. Constructed working with heavy duty and trustworthy materials. The HOPPE'S phosphor bronze brushes is evidence of their dedication to supplying the best cleaning instruments for virtually every shooter. HOPPE'S bore brushes are ideal for most cleaning jobs. These brushes provide a thorough multi directional scrubbing action. The stout bristles are efficient for cleaning.Designed for use with .17/.204 caliber, Centerfire/17HMR Rifle Compatible with Hoppe's Elite and Hoppe's one piece .17 caliber cleaning rods