Engineering & Construction Machinery PartsChina Steel Tooth Tricone Bit 17 1/2" (444.5mm) IADC215g Milled Tricone Bit / Drilling Bit, Find details about China Drilling Bits, Drilling Tools from Steel Tooth Tricone Bit 17 1/2" (444.5mm) IADC215g Milled Tricone Bit / Drilling Bit