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4.1/2", 4.3/4", 5.1/8", 5.5/8" Non-Coring PCD Bit, Find Details and Price about PDC Bits PDC Drilling Bits from 4.1/2", 4.3/4", 5.1/8", 5.5/8" Non-Coring PCD Bit - Wuxi Geotec Geological Equipment Co., Ltd.