Our company offers oil drilling tips, These kinds of tips are using for oil drilling, coal mining bits, salt mining bits, mining bits etc And there are many types, For example: Type HCE\Type HCP\Type HCQ\Type HCQ-1\Type HCS\Type HCZ\Type HCZ-1\Type HCZ-2 and so on. What’s more, different type can be designed according to the customers requests.