Support members are located near the corners of a pair of printed circuit cards for holding them together in a fixed, spaced-apart, adjacent and parallel relationship. Each card has a group of holes formed in the same pattern in each of the four corners thereof, at least one hole of each group extending all the way through the card. Each support member comprises a pair of plates that are joined together at a 90.degree. angle along one edges thereof. Load-bearing pegs project from parallel, non-joined together edges of one plate. Flexible posts project from parallel, non-joined together edges of the other plate. An arm extends from each post proximate the end thereof that is spaced from the other plate and in a direction substantially parallel to said parallel edges of the other plate. A post and peg are located on adjacent edges of the plates such that they fit into corresponding holes in the same group thereof on a PC card, with the arm extending through a hole and snapping over the associated card to hold it in place. The pegs operate as load-bearing members when axial pressure is exerted on the plates to insert a card into or remove it from a shelf.