This hone features a 240 grit boron carbide polishing compound that creates a uniform surface with high wear resistance. It smoothes out folded or drawn metal, creating a surface that holds oil and reduces friction. .473" in diameter, 8" long. Notes:The manufacturer recommends the use of Flex-HoneA(R) oil for use with these hones. It is specially formulated for use with Flex-HoneA(R) hones FeaturesTwisted steel wire shaftAbrasive globules on flexible nylon filaments240 Grit Material