We make various step drag bits, for soft formations drilling
Huanyu make good quality drag bits, we export to more than 50 countries till now and get good feedback from clients, hope we could serve more clients on step drag bits in future.
To keeping posted the latest info. of step drag bits, follow Shirley on facebook:
http://www.facebook.com/rockdrillbits or Wechat: shirleyli09, Viber and Whatsapp: 0086-15227548680
