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190mm 7 1/2"IADC227 Steel Tooth with Sealed Bearing TCI Tricone Rock Drilling Bits, Find Details and Price about Drilling Bit TCI Water Drilling Bit from 190mm 7 1/2"IADC227 Steel Tooth with Sealed Bearing TCI Tricone Rock Drilling Bits - Urumqi Siruite Mechanical Equipment Co., Ltd.