This is our first generation Escape Hatch. If you would like to see the second generation Escape Hatch, which works with our cat mod attachment options, follow this Link This is a fun shelf with a large hole lined with sisal, for climbing ease. See below for a video of our cat Heisenberg playing on it. These can be ordered with the hole to the left or right. We alternate these going up the wall, which is great to gain height in area with limited wall space and also a great way to keep dogs out of a cats area. The Escape Hatch comes with two brackets come attached and spaced out a 16, for each go into a stud. When screwed into studs, all of our wooden shelves are very strong and have been tested to hold 85 lbs. All of our furniture also comes with screws and drywall anchors. Dimensions: Width: 18 Height (including brackets): 6 Depth: 11 Pictured is an Escape Hatch stained English Chestnut.