... cutters8,Certification: API9,Applicable of: petroleum&gas,water well and mining10,Bearing sealed: metal sealed(HJ) rubber sealed(HA ... tci bits maximize the use of bothconical and chisel tungsten carbide inserts of large diameters and high projection. This cutting ... well, oil field, underground, construction, geothermal well,etcSize Available:From 3 7/8"(98.4mm) to 26"(660.4mm)Note:Sizes and types that ...