>>> Synthetic Diamond & CBN Honing stick is a kind of renewing product extensively applied in machine making industries such as cylinder, oil cylinder and precision inner circle processing. >>> Featuring high efficiency, long life and superior precision of processing, they have gradually replaced the traditional silicon carbide honing sticks. With much longer life than traditional grinding tools by 500 times, higher working efficiency that improved at twice, and better brightness improved about 2 to 3 grades, they are really the ideal choice for honing technique.