17 1/2" 444.5mm IADC517g Tricone Drill Bit Drilling Water Well Bit
China 17 1/2" 444.5mm IADC517g Tricone Drill Bit Drilling Water Well Bit, Find details about China Drill Bits, Tungsten Carbide Inserted (tooth) Bit from 17 1/2" 444.5mm IADC517g Tricone Drill Bit Drilling Water Well Bit