the mounting locations 135 after the flange 85 has been fastened to the wall 140 the second member 75 is inserted into the first member 70 in a direction substantially parallel to the length of the web 100 the second member 75 is inserted to a selected position the protrusions 115 of the web 100 engage the indentations 95 in the channel 90 thereby adjustably securing the second member 75 to the first member 70 the second member 75 can be moved between possible positions along the web 80 of the first member 70 without the use of a tool as shown in fig6 the stop 99 limits relative movement between the first member 70 and the second member 75 the stop 99 prevents movement of the first member 70 across the apertures 95 such that the apertures 95 are not covered by the web 80 of the first member 70 fig1 illustrates a wall mounting system 155 including multiple wall fixtures 65 as described above the wall fixtures 65 are fastened to the exterior wall 140 the wall fixtures 65 are fastened to each other using fasteners such as for example threaded fasteners nails cohesive bonding materials glue adhesive pins clips clamps inter engaging elements and any combination of such fasteners in use the wall fixtures.