The bunker is built for a full day of cat. There is a feeder and a planter to nose around in, tapping that treat-hunting instinct, a ramp and a scratching pole to work the muscles on the way up, and a spread of fabric hammocks waiting at the top for the inevitable nap. It gives several cats room to roam and do their own thing.With that much going on, it keeps a multi-cat home from tripping over itself, everyone has somewhere to be. It is made for studs at either 16 or 24 inch spacing.