Clean up unused shelf adjustment holes with these 3D printed bookshelf hole plugs, designed for Billy style shelving, bookcases, cabinets, and storage units. Each plug has a smooth, straight, non-threaded body with a flat round cap that presses into open shelf pin holes for a cleaner, more finished look. Made for matching different bookshelf colors, these plugs help hide exposed holes while keeping the original furniture look simple and organized. They are easy to install, require no tools, and can be removed when you need to adjust shelf height later. Great for bookcases, display shelves, cabinets, media units, storage cubes, office shelving, and other furniture with compatible shelf adjustment holes. Available in multiple colors to help blend with white, black-brown, brown wood grain, light wood, and blue furniture finishes.