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Different PDC bits The PDC bit is an abbreviation for Polycrystalline Diamond Compact Bit, also known as polycrystalline diamond cutting block or composite bit. Since the introduction of the PDC cutting block by General Electric Company in 1973 and the development of the first PDC bit, the PDC bit has been widely used in oil drilling due to its advantages of fast drilling speed, long life and high footage. Almost all drill manufacturers have adopted this technology to start producing their own PDC bit series.