... well drilling Advantage: 1> TCI tricone bit, steel teeth tricone bit,rock bit,milled tooth bit,tci bit,steel tooth bit2> Certified by ISO9001 ... Wear resistance of cutting structure is enhanced by setting diamond inserts in the permanent contact area of the cone where ... inserts on bit body, the bit has good gauge protection inserts on bit body, the bit has good gauge protection and up drill capability3> ...