A pull-out guide assembly for drawers comprising a pull-out rail fastened to the drawer, a supporting rail fastened to the body of the piece of furniture and a center rail differentially running between said two rails on each side of the drawer. Running carriages which hold load-transmitting running rollers are arranged between said rails. Driving rollers which run on the supporting rails and on the pull-out rails are mounted on the center rails. The center rails have Z-profiles, and the supporting rails and the pull-out rails have U-profiles which are substantially half-covered.
