GJ/GJT Metal sealed bit with roller bearing GJ/GJT series bit adopts metal seal with roller bearing, which can drill stably with middle to low WOB and middle to high RPM, it鈥檚 the ideal choice for higher part of well section. The size range of GJ/GJT series bit is from 8 1/2 to 17 1/2 inch, and IADC varies from 115 to 545.
17 1/2 GJT 515GC tricone bit 
