Abstract: A profile rail for affixing a flexible, sheet-like structure such as a canvas, onto a substantially flat carrier or plate has a substantially U-shaped cross section and two flanges, by means of which it can embrace an edge of the carrier, and comprises a series of teeth or projections. To make possible an easier and more rapid attachment of the canvas to the carrier and subsequent removal of the canvas therefrom the teeth of the profile rail are provided in at least one circumferentially extending line on the outside of the arcuate web of the U-rail.