than the particular mounting brackets shown may be used to secure the work surface such as a slide and drop arrangement of slots and pins referring now to fig7 73 another feature of the invention is that it is readily adapted for the incorporation of drawer slides and such slides may be used to mount work surfaces as seen in fig7 shelves fig7 or files fig7 in fig7 there is shown a three piece drawer slide having an outer section 301 and intermediate section 302 and an inner section 303 this is a conventional drawer slide except that the outer section 301 is provided with a first tab 304 and a hooked tab 305 to fit into and be secured to the upright channels in a cabinet side panel or similar structure in fig7 two drawer slides are shown and designated 300 and a work surface 307 is mounted to the innermost sections of the slides so that it may be pulled out as desired in fig7 a bottom shelf 309 is secured to the inner sections of the drawer slides 300 and it includes laterally spaced forward slots 310 and a set of aligned rear slots 311 formed in an upright rear flange 312 in fig7 the drawer slides 300 are used for mounting a frame 320 including first and second frame members 321 322 parallel to the drawer slides and spaced for mounting legal size pocket folders such as the one designated 323 the frame 320 includes first and second transverse frame members 324 325 which are spaced for mounting a letter size pocket folder 328 it.