A shelving construction which includes upright members having a U-shaped cross-section and a plurality of shelves connected between the upright members, is improved by providing at least one stiffener plate extending between and into two upright members disposed so that the flanks of each upright member extend toward the other upright member. The stiffener plate has an effective width so as to be snugly received within the upright members. Each upright member defines at least one bridging portion, and the stiffener plate has, for each bridging portion, two spaced-apart protrusions such that the bridging portion can snap into place between the protrusions when the stiffener plate is inserted into the respective upright member.
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