... time 3. wear resistance 4.swift delivery Zhuzhou Dong Ya tools Co,Ltd. is a professionalmanufacturer of Cemented Carbide products.Withyears' experience,our ... management Our main products include:cemented carbidedrills,cutting cutters,mining tools,drawingdies,carbide strip,rods and so on.skillful workersand advanced ... ,you surely beresponsed in the fastest time!! cemented carbide tools carbide drill bit