... good location and convenient transportation.Huanyu specializes in water well drill bits,oil well drilling bits ,like: Tricone Bits (Steel ... ,pdc cutters8,Certification: API9,Applicable of: petroleum&gas,water well and mining10,Bearing sealed: metal sealed(HJ) rubber ... inch)Type tricone bits,steel tooth bits, PDC bitsApplicable water well,oil field, construction, geothermal, directional boring,and ...