Embodiments disclosed herein are directed to a shelf and shelving system for a refrigerator door having a door liner with opposing side walls, where each side wall includes a row of ditch steps. The shelf or shelves includes a gap wall at each end of the shelf. A switch is positioned above each gap wall. Each switch includes a handle, a mounting rod and a biasing member for biasing a long component of the handle outwardly away from the gap wall such that an engagement surface of the long component will engage a ditch step and thereby secure the shelf in place within the refrigerator door. The switch is actuatable by a user to allow for vertical adjustment of the shelf along the rows of ditch steps or to remove the shelf therefrom.