1.Roller bearing tricone insert tooth drill bit
2.Cover almost all IADC code
3.Meet with API Spec7-1 ISO 9001:2008
3.Meet with API Spec7-1 ISO 9001:2008
4.Roller bearing
5. High temperature and wear resistance
6.Long work time
7.Good quality and resonable price
8.IADC code suitable for different formation