Shelf label holders are objects, usually plastic or metal, that attach onto the shelf lip of bookshelves. Identifying labels are then put on the label holders.
Shelf label holders make organizing the content on shelves very convenient. It is possible to sort the books in the bookshelves and never have a hard time finding specific books, because they are identified and sorted by labels. The label holders come in many different types and sizes; some are plastic, while others are metal. They can clip onto the shelf lips or stick on with a peel-off adhesive. If the bookshelves are metallic, they can attach themselves through a magnet.