If you have a warehouse or a large retail store, you how important it is to find things quickly. And what better way keep track of your inventory than with easy-to-use label holders. A label with a product name, item number or SKU, or barcode can help you more find and fulfill orders faster. If you own a bookstore or have a huge company library, a book shelf holder can help you organize your books by subject, author, or title. These clear plastic holders clip right onto your existing shelf in a jiffy.