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12-1/4" Kingdream IADC 517 New TCI Tricone Bits for Oilfield Drilling, Find Details and Price about Steel Tooth Bit Pdc Bit from 12-1/4" Kingdream IADC 517 New TCI Tricone Bits for Oilfield Drilling - Hejian Longxin Petroleum Machinery Accessories Co., Ltd.