METAL BOOK END: Our set includes 6 bookends for shelves (3 pairs). Each shelf measures 18.7 high x 12.5 long x 15.8 wide. There is a hole with a diameter of 4 mm at the base of the book holder. Our book dividers are made of metal which will not rust or stain. Since they are made of metal, they will not bend, break or scratch. They have a glossy black finish. RESISTANT AND STABLE: These shelf book dividers are resistant and durable. They weigh 312g. At the base of each decorative bookend there are 3 non-slip pads. These bookends keep your books in place and also protect your furniture from scratches. If you require more stability you can screw them in using the 4mm hole in the base. Our T-shaped bookends have rounded corners, which are smooth and safe when you remove the books. MODERN DESIGN: The bookshelf bookends have a modern design and since they are thin, they do not take up much space. They are discreet since they are flush with the books it shows. You can hide the shelf bookend inside the cover of the book, so the book appears to stand upright on its own. Since they are black, they match any home decor. They come plain and have no logos on the sides. They are very functional and can be used with many different books. STORE BOOKS: Our bookends can be used to store soft and hard cover books. Use them to hold catalogues, magazines, large A4 textbooks, folders, cookbooks, comics and photo albums. Use them in an office to store files and notepads. You can also use them to store DVDs, CDs, vinyl and movies. You can use them at home, in the office, libraries, on shelves and tables.