Spyder Shelf is a handy accessory you can attach to your computer monitor to provide you with vertical storage space, freeing up your desk space. The shelf is made of sturdy steel, with a textured surface for non-slip safety. The shelf is easy to attach and remove, with an overhanging lip that grabs onto the front of your monitor for support. It also includes a tab you can slide over your computer’s camera lens when you want to ensure visual privacy. There is an exposed screw thread designed to affix your SpyderX monitor calibrator to for added convenience. Note: Maximum weight capacity for Spyder Shelf is 4kg./8.8 lbs. Do not place liquids or beverages on shelf. When sliding shelf to hide or expose computer camera lens, it is recommended to remove all items on shelf prior to moving it.