These clever shelves mount directly to a wall stud, and are invisible when loaded with books.  Each shelf holds books up to 10 inches wide, and 20 pounds in weight.  Comes with the mounting instructions and hardware.  Please email any and all questions before bidding or buying.  Buyer will pay the Actual Shipping Costs based on the Size, Weight and Destination of the Package.  Thanks for Looking, and Good Luck!  KL 09/25/21.