Our 0.17HMR/0.177 Airgun brushes measure 1 inches In L, making them ideal for limited breech cleaning. These brushes from Otis feature a proprietary Tufcor core wire that's resistant to corrosion and boasts a tighter twist for improved bristle retention and extended brush life. With double the fill compared to other brushes and bristles extending right to the end, you can expect superior quality and precision cleaning with each use.