foot 100 having a socket 102 defining an inner diameter 104 and an extension 106 support shoe 100 may be secured to a surface by use of fasteners such as the illustrated bolts 108 inner diameter 104 may be configured to mate with the outer diameters of posts 14 and 30 as with the embodiment of fig7 fig9 illustrates a wall mounting bracket 110 having one or more flanges 114 configured for engaging a wall an outer wall 118 is provided with a plurality of notches 122 which are configured for mating with rear sockets 26 for example fig1 is a perspective view of an adjustable wall mounting bracket 130 having one or more flanges 134 spaced apart from a rear flange 138 an adjustable notched mounting element 140 has one or more bottom flanges 142 and an outer wall 144 in which a notch 146 is defined the adjacent flanges 134 and 138 are offset so as to define one or more slots 152 into which flanges 142 may be inserted depending on the intended use fasteners will then be attached to join elements 130 and 140 together when notch 146 has been located at the desired height for supporting shelf 18 fig1 illustrates a single shelf bracket 160 having a pintle 164 thereon pintle 164 may be provided with a sloped surface 168 the outer diameter of pintle 164 may be sized so as to mate snugly with inner diameter 70 of socket 26 likewise sloped surface 168 is provided to enhance engagement of pintle 164 with socket 26 pintle 164 may be provided on an extension 172 attached to a mounting flange 176 fasteners 178 may be used to secure.