12 1/4" roller bit /drill bit made in china factory and good quality
Quality control Every product of GREAT have the quality test report table to record the product test parameters during manufacturing. For controling the quality strictly and tracing the working condition of bits. Main products: PDC bit, tricone...
steel body PDC bit, matrix body PDC bit, PDC coring bit, RC PDC bit, PDC hole, Bi-center PDC, Roller cone bits, TCI bit, Milled tooth bit, HDD hole opener, PDC reamer,