Totally Tiffany-ScrapRack Expansion Base Spinders. Expansion Bases are perfect for adding more space to your organization system. Each Expansion Base comes with eight Spinders. A Velcro connection piece will be included with your Expansion Base, use it to attach your bases together. The Expansion Base is designed to expand your ScrapRack system. You must also have a Basic with Wings to use the Expansion. This 16x14x3-1/2 inch package contains one expansion base, eight spinders, one fabric attachment piece and one hinge pin. Assembled size: 15x13x7 inches. Imported.