API factory PDC Bi Center Bit for Under Reamer drilling

BI center bit is used for reaming hole bottom, the model No. likes 5 7/8″*7 1/2″*4 3/4″ or just 5 7/8″*7 1/2″ as the third diameter is not important.

5 7/8″ is the passing through diameter, 7 1/2″ is the reaming diameter, 4 3/4″ is the diameter of front bit.

Far Eastern are  factory  specializes in drill bits,such as roller cone bit, tricone roller cone bit, tricone bits,HDD hole opener,Foundation roller cutters for different applications. The application including oil field,natural gas,geological exploration,driectional boring,mining ,water well drilling ,HDD, construction,and foundation.
As a leading drill bits factory in China,increase the drill bit working life is our target. We always try to improve the bits with high penetration rates.Our purpose is to sell the high quality with the lowest price.Far eastern drilling quality and technology will help you to achieve more