... bits, milled tooth bits, TCI rock bits, oilfield bits and so on .There are different PDC (polycrystalline diamond compact) ... used in the field of mine, transportation, tunnel and hydroelectric for shelving reticular support.Model114,117,127,437, ... Applicable water well, oil field, construction, geothermal, directional boring, and underground foundation work Formation sticky, soft, medium hard, hard ...