Abstract: A shelving support system is disclosed (FIG. 3 ) comprising a series of spaced vertical columnar supports 300 of steel channel having a series of cutouts 320 formed at regularly-spaced intervals in the flanges 308 thereof. Each cutout 320 defines an upper lip 323, a lower lip 235 and a rear horizontal shoulder 342. Linear extrusions 324a and 324b of suitable aluminium or plastics material which define shelf-slots 326 are fitted into cutouts 320 so as to be horizontally located between the backs of upper and lower lips 323 and 325 and the rear periphery 344, and, so as to be located vertically by the underside of a shoulder 342 formed on flange 308 at the rear of the cutout and a land 362 and/or the top of the lower lip 325 at or near the lower front of the cutout.Each extrusion 324 includes a curved, forwardly-facing, hook-like thumb-strip formed along its upper wall which hooks behind upper lip 323 when the extrusion is in place within the cutout 320.