Anchored to a restraint device on the end of the remote manipulator system (RMS) robot arm, astronaut Michael Lopez-Alegria uses a pistol grip tool. Astronauts Lopez-Alegria and Peter J.K. (Jeff) Wisoff, both mission specialists, were participating in one of two space walks they shared. The mission afforded four space walks designed to put final touches on the ISS prior to the upcoming first leg of permanent occupancy of the station.