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The strength and wear resistance of inserts are improved by using carbide inserts with high strength and high wear resistance. Surface of the high precision bearing heat treated by using advanced heat treatment process to improve the load capacity and service life of the bearing. The service life of the bearing is further extended by adopting harder and more wear resistant material for thrust bearing.Uses and Applicable Ranges of the Bit:Uses: The bit is used for air drilling, e.g., for drilling operations in open coal mine, iron mine and development of non-ferrous mine.Applicable Ranges: The bit is applicable for drilling hard formations with high compressive strength, such as dolomite, hard sandstone, granite and chert, etc.Basic Specifications of the Bits:IADC Code: 7-4-2Rock Bit Diameter: 7.875 inches (about 200mm)Bearing Type: Roller-Ball-Roller-Button/ButtonCutting Structure: Inner Rows and Nose Rows: Ogive InsertsGage Row: Round Top InsertsPin Connection: 4 1