... water well, oil field, underground, construction, geothermal, directional boringDescription: 1> Cutting structureIn response to the characteristics that inserts in different areas ... so that the drilling efficiency is greatly improved. Wear resistance of cutting structure is enhanced by setting diamond inserts in the permanent ... , 537, 6175 7/8149.2517, 527, 537, 6176152.4517 single roller cone bits