... 617, 637,737,827 TypeTri-cone bits, Steel tooth bits, PDC bits Applicablewater well, oil field, construction, geothermal, directional boring, ... bits used for oil filed,waterwell. Including tricone bits, PDC bits and drill bits. Various of model and dimension available ... 17 1/2(inch)Type tricone bits,steel tooth bits, PDC bitsApplicable water well,oil field, construction, geothermal, directional boring ...