Perfect for Expanding Book Collections: If your favorite author has penned numerous novels, you'll appreciate the four sturdy engineered wood shelves this bookshelf boasts an essential for avid readers. Sturdy Support for Oversized Books: The 20 x 40 mm thick iron frame and crossbars on the lower level provide ample support, accommodating up to 25 kg per shelf. This robust construction is ideal for storing hefty book collections.