Machine tools, namely power operated downhole tools used for the drilling of oil and gas, namely power operated drill bits, reamers, cutters, junk subs and debris catchers, and power operated fluid filters for selectively filtering and removing solids from downhole fluids; apparatus for use in the cleaning of oil wells including the cleaning of casing strings, liners and other well tubing, namely power operated wipers, scrapers, brush tools; power operated well clean up tools, namely circulation tools, casing scrapers and brush tools in the nature of power operated wipers, scrapers, brush tools, polishers and scourers for maintaining a clean interior of a casing or liner within a well bore, power operated shoes, drill bits and reamers having means for circulating fluids, power operated fluid circulators that cause downhole fluid to impact the interior of a casing or liner within a well bore to provide a cleaning action, and which select a path for fluid travel in a casing or liner within a well bore, and parts and fittings thereof; power operated apparatus for isolating zones or creating barriers in well casings namely, zonal isolation packers, mud packers, packer installers, inflatable packers and packer setters