This hone allows you to remove any imperfections or machining marks left in your rifle's chamber. The result is a bright, wear-resistant finish that will improve the quality and feel of your rifle. Notes:The manufacturer recommends the use of Flex-Hone oil for use with these hones. It is specially formulated for use with Flex-Hone hones FeaturesTwisted steel wire shaftAbrasive globules on flexible nylon filaments3" abrasive section, 12" overall length