Adjustable Bed Risers are the best solution to raise your for Bed, Furniture, Sofa, Table or Chairs. This 4-piece set of heavy plastic bed risers allows you to raise your bed, dresser, table or chair by 3, 5 or 8 inches depending on which size and configuration you choose.Great for dorm beds or any room in the house. Internal dimension is 1 mm side per each so approximately 14 mm internally