... 1/2Φ7 7/8Φ8 1/2Φ9 1/2mm118mm149mm152mm165mm168mm190mm200mm215.9mm241mm In.Φ9 5/8Φ11 5/8Φ12 1/4 ... tectonic industries, oil field, construction, geothermal, directional boring and underground foundation work, water conservancy and hydropower(3)The PDC cutter features1 ... to inserts with customized angles, diamond thickness, chamfers, and sizes. 9 1/2 PDC oil drill bit