... technical staff familiar with drilling. We are handling in tricone bits, PDC bits, core drill bits, drilling accessories and so on.Here is the range ... and ager-sales services. Our products have used in many oil fields. Such as Talimu, Tuha, Changqing, Liaohe, Dagang, Sichuan, ... the products we supply have been certified by the ISO, API. HUASEN seeks to satisfy our customers with qualifiedly products, ...