Now the requirements for hole tolerance and finish are getting higher and higher. It is difficult for general tools to meet the processing requirements of the workpiece. At this time, it is necessary to insert PCD inserts on the conventional tools to achieve the corresponding tolerance size and hole wall finish and improve the processing speed; For the use of such tools for finishing, our company can design PCD tools of various sizes according to the processed products. The smallest of such tools can be a diameter of D2.5 or more.