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IADC114 115 117 8 1/2'' 12 1/4'' (215.9mm, 311.15mm) Steel Tooth Tricone Bit, Find Details and Price about Steel Body PDC Drilling Bits Oil Well Drilling from IADC114 115 117 8 1/2'' 12 1/4'' (215.9mm, 311.15mm) Steel Tooth Tricone Bit - Hebei Ruishi Bits Manufacturing Co., Ltd