Organize your Cube Shelves with this Adjustable Shelf Organizer Cube Insert. Great for displaying knickknacks and organizing your craft room or office. This insert WILL hold 12" x 12" paper for Better Homes and Gardens, Thresholds/Brightroom and Kallax cube shelving. This cube insert works best with Cube Shelving that have a back or that are placed against a wall. A great option for storing paper, puzzles and board games. You can use this insert to display figurines, amiibos, small toys and collectibles. We make our Adjustable Shelf Organizer Cube Insert for the following brands of cube organizers. Please see 2nd picture for dimensions of each cube. 1. BH / Better Homes and Gardens Cube Storage Organizer 2. Thresholds/Brightroom Cube Organizer Shelf 3. IKEA Kallax Shelf Unit The opening width of the insert is as follows: 1. BH / Better Homes and Gardens Cube Storage Organizer 12-1/2" 2. Thresholds/Brightroom Cube Organizer Shelf 13" 3. IKEA Kallax Shelf Unit 12-3/4" The holes are spaced 1-1/4" starting from the center. There are 9 sets of holes and you can purchase up to 9 shelves. Each shelf will come with 4 shelf pins. Please contact us if you would like to purchase more shelves, shelf pins or side boards. This product is very easy to assemble and does not require any tools. Simply place the 2 side boards with holes on either side of your cube. Insert the shelf pins at the desired level. Place your shelf onto the shelf pins. Available in Unfinished or White MDF.