17 1/2" Milled Tooth Tricone Bit IADC 127 Metal-Sealed Bearing Well Drilling Bits

China 17 1/2" Milled Tooth Tricone Bit IADC 127 Metal-Sealed Bearing Well Drilling Bits, Find details about China Tri-Cone Bit, API Certification from 17 1/2" Milled Tooth Tricone Bit IADC 127 Metal-Sealed Bearing Well Drilling Bits