Includes two major materials: high-speed steel and cemented carbide. The product specification is Ф4.3mm-Ф80mm, the head angle includes 60 degrees, 90 degrees, 82 degrees, 120 degrees, etc., cemented carbide countersink is a special program for the processing of wear-resistant steel; it has 5-axis linkage precision grinding which is manufactured according to DIN335C standard.