There are at least 2 bands with this name.
These are photos from concerts where Giant Step played, so they may be of other bands that played the concert as well.
Local H / Woolworthy / The Last Vegas / Giant Step / American Motherload / Blackbox Oct 31, 2004 Chicago, Illinois, United States Uploaded by Woolworthy
Emily Shrine / Giant Step / Elevator Division Aug 4, 2002 Kansas City, Missouri, United States Uploaded by Artdjg Credit: DJG