The Rock Abrasion Tool (RAT) is a grinding and brushing installation on NASA’s twin Mars Exploration Rovers, Spirit (MER-A) and Opportunity (MER-B), which landed on Mars in January 2004.

The RAT then uses two brushes to sweep dust from the bore holes for closer scientific inspection.

The RAT provides these instruments with a smooth, clean surface from which they make more accurate observations.

The RAT was originally controlled from NASA's Jet Propulsion Laboratory in Pasadena, California, but is now[when?]

The cable shield of each RAT is made from aluminum recovered from the World Trade Center site after the September 11 attacks.