The SWITCHBACk* (SWB) casing  cleaning tool is versatile and can be  configured as a scraper, brush or mill.  It can be run as an integral part of the  

BHA while drilling the final hole section  multiple tools can be run in a single string  that allows scraping, brushing, milling,  or a combination of all three operations.  

While RIH and during drilling operations  the component pads are recessed. Once  drilling operations have reached TD the  SWITCHBACk tool can be functioned by  

dropping a ball and applying pressure. As  the ball shears through the tool the pads  extend to begin the clean up operation.