Longyue Was established in 1998,located in Cangzhou which is in the industrial zone of Cangzhou city ,and enjoys good location and convenient transportation.Longyue specializes in water well drill bits,oil well drilling bits ,like: Tricone Bits (Steel tooth & TCI bit),Tri-cone Bit, Three cone bit,Tricone Drill bit,tungsten cabide inserted bits, Tricone rock bit, Milled tooth bit, Roller Cone Bits ,matrix body PDC bits, steel body PDC bit, Reamer bit, drill pipe, drill collars, engineering bits, stabilizers, for water well ,oil field, construction and underground foundation work all over the...