This helps picture hang straight and keeps dust from collecting behind picture. Pieces of foam rubber or cord can also be used. Adjustable clamps can be used for hanging pictures. They are available in plastic or metal at art and book stores. Using these, you can hang pictures with or without glass.
Clamps are best for temporary use.
If you aren't sure you want to frame a picture for a particular spot, hang it with clamps until you decide. These are ideal if you wish to change pictures often. Molding properly mounted on the wall will also serve as a frame for one or more pictures. You can also change pictures in these collages often. Copyright 1999 University of Missouri.