PDC Drill Bits, Drag Bits, Tricone Drill Bit manufacturer / supplier in China, offering 75# 3"Three Wings Reinforce Concave Custom Thread Drag Drill Bit, 112# Ca-4 Cemented Carbide Geological Sample Rock Drill Bit, 112# Cm-5 Hard Alloy Irregulary Teeth Insert Use for Sand Clay Drilling and so on.
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