This 48 x 18 x 74" wire shelving add-on unit expands an existing starter unit by sharing its posts, adding four full-width shelves and a second vertical column without duplicating the entire frame. Each unit ships complete with two posts, four shelves, and eight S-hook connectors for a self-contained installation.

The add-on supports straight-line, back-to-back, and right-angle (L-shape) configurations, making it well-suited for warehouse storage bays, distribution center stockrooms, retail backrooms, and light manufacturing floor layouts where modular expansion is preferred over purchasing standalone units.

Shelves span 48 inches wide by 18 inches deep across a 74-inch height profile, with additional shelves and accessories available separately for further customization. Note that a starter-and-add-on combination is not compatible with caster mobility kits. Sold individually; unit weight is 63 lbs. Freight delivery required.