... 517, 537, 617, 637,737,827 TypeTri-cone bits, Steel tooth bits, PDC bits Applicablewater well, oil field, construction, geothermal, directional boring ... bit,Milled tooth bit,Roller Cone Bits ,matrix body PDC bits,steel body ...3.API Tricone Rotary Bits1,Types: steel tooth tricone ... :Center Drill BitGuarantee period:2~4 yearsUse:Well Drilling Rotary speed:300~80r/minTypes of Sesling:Rubber RingsTypes of ...