6 1/8inch TCI Tricone Bit

TCI Tricone bit,TCI standards for tungsten carbide insert bit,tci tricone bit is also called rock bit,tci rock bit,tci insert bit,three cone bit,rotarty bit,tricone roller bit,it has two types of bearing: sealed bearing or open bearing .Sealed bearing: rubber sealed bearing (also called as elastomer sealed bearing),which include roller sealed bearing or journal sealed bearing .