Wholesale API 12 1/4 inches hole opener with spiral blades and back reaming cutters for oil well drilling in the stock from China OEM manufacturer. This is a spiral blades PDC hole opener, upper is 6 5/8 API reg box, bottom is 4 1/2 API reg box, drillers could fit PDC bits or motor applicable tricone bits in  front. The long PDC blades performs like a near-bit stabilizer and a reamer that keeps hole at straight trail and reams well-wall smoothly. Far Eastern also produces PDC hole opener for HDD/No-Dig application, please contact us to get more information.Far Eastern are  factory  specializes in drill bits,such as PDC bits, 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 !