Use a set of corner connectors on

Each shelf to attach an add-on unit to a basic unit to form a 90C angle.

Form a U shape by using a set of corner connectors on both ands of each shelf to attach shelves between two basic units.

Corner connectors easily snap onto the traverse of the first unit.

The traverses snap onto the dovetail on the corner connectors just like they snap onto the dovetails on the posts.

Winshelvings Corner Unit and U shape Units