Drapery brackets are used to support drapery and curtain rods. There are a variety of types, styles and strengths of drapery brackets available. Some of the things you will need to consider depending on your needs;
Type - The style bracket or mounting system your application requires.
Projection - You will also need to select the projection (the distance the rod will some out from the wall or ceiling. Typically 1.5" projection brackets are used for hanging tapestries, 3" projection brackets are used for most single layer window treatments and 6" projection brackets are used for two layer treatments.
Strength - Heavy duty brackets have a reinforcing rod welded from the base of the bracket to the underside of the rod cup and should be used if hanging heavy weight fabrics to prevent the bracket from sagging under full loaded weight.