Abstract: A metal pallet rack of the vertically adjustable type having at least four rectangularly spaced vertical support posts, a plurality of pairs of horizontal shelf beams detachably mounted on the posts by means of post-to-beam connectors, and a plurality of stamped steel metal hook elements integrally attached to each post-to-beam connector, the hook elements being detachably engageable with a vertical series of keyhole shaped apertures in the front wall of each post, each such keyhole shaped aperture having a minimum lateral dimension substantially greater than the gauge of the sheet metal of said hooks.