Abstract: A sleeve for a shelving unit has two halves joined together to form two support tabs extending outward from opposing sides of the sleeve as the sleeve clamps around a post having grooves into which a rib on the sleeve fits to hold the parts relative to the post. The support tabs have a retaining flange offset from the sleeve, at each of two opposing sides of each sleeve. A first collar part fastened to a shelf fits over half the sleeve and fits into that offset so that a slot in the first collar part fits over two abutting support tabs to clamp them together and wedge the sleeve against the post to support the first collar part and shelf. Each retaining flange has a latch portion on its outer surface that engages a mating latch portion on the abutting support tab prevent lateral separation.

Abstract: A bracket for releasably connecting to a support structure having a shaped opening. The bracket has a mounting plate with a rearward extending flange on each side of the mounting plate and extending a distance the same as a thickness t of the mounting plate. Two rivets extend from a back of the mounting plate with an enlarged head of the rivet configured to releasably interlock with the shaped opening. The rivets are aligned along an axis that is vertical during use. One of a hook or arm is connected to the front face and preferably rotatably mounted to rotate vertically between a folded position and an unfolded, use position where items can be hung from the hook or arm.

Abstract: An improved sleeve for a shelving unit having an annular collar wedge the sleeve against a post, wherein the sleeve has one of a retaining wall encircling the bottom of the sleeve or a retaining latch extending from a bottom of the sleeve, both to position and retain the collar during assembly and to support the collar during use.