Reverse circulation is a type of drilling technology, the mud fluid inside drill pipe goes from bottom to ground, big size rock chips could be sucked away from hole bottom to avoid breaking repeatly, so the drilling speed is much faster and high efficiency. 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