1.Bit name:tricone bit,button bit,rock bit,TCI tricone bit,insert bit
2.metal face sealed journal bearing
  journal bearing and metal face seal;it can perform high consistence
3.special gage protection on cone
   a row of trimmers is added between heel row and gage row compacts.As a result,no only cone shell is protected,but also the borehole wall is properly timmed.
4.head OD reinforcement
   head OD are designed with carbide inserts to protect the shirttail and seal to effectively improve the bits' ability prevent diameter shrinkage.