Use this package when stacking units. Fits on top via stack pins and has a swing gate that opens on each end. Includes a toe board all the way around the bottom. Fits down on the walkboard for a snug perfect fit and is located inside the outer end ladders. This allows the unit to be moved up or down with the side rails...Gate swings to the inside and uses a gravity lock stud to lock in the closed position. Yellow Powdercoated. 2 End panels and 2 Side panels included.