http://www.ec21.com/ec-market/pdc bit.html http://amyiven.en.ec21.com/PDC_Bit--2254452_2409263.html PDC bit for bolting hole drilling, Mineral exploration, hot spring, oil and gas drilling etc. Diameter: 27mm to 508mm 20091228 http://bitschina.en.ec21.com/Used_PDC_Bits--4001649_4001650.htmlpdc bits and scrap tricone bits. 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