The Curved Wall Picture Hanging System works with both types of curved walls: outward curve (convex) or inward curved shape (concave) and round circular walls. Easy to install Aluminium Flexi rail comes in straight lengths of 2M and 3 Meters which you can cut to size. Flexi rail comes with 4 pre-drilled holes per meter but you can make new holes if required.  You can start screwing Flexi rail from one end and screw force bending the flexi aluminum rail according to the angle of curve. Work with any angle curve deep or less deep even with round circular walls. Profile size is 19X7X9 MM.