AR SHELVING Storage Rack 39.4 (W) x20 (D) x 71 (H). Let's face it, that garage is not going to organize itself. Let AR-Shelving's 5 tier rivet storage rack help you declutter and organize your garage, office, basement, or storage shed with this adjustable shelving unit. Save space and time with the STURDY, AFFORDABLE and EASY to put together galvanized rack. Each shelf is made with high density fiberboard (HDF) - much better than MDF because it is both stronger and more resistant to moisture, giving it better holding capacity. The boltless rivet system makes for a quick and easy installation, allowing you to tackle other projects around your garage, home or office.