Plastic Stacking Design: Bed risers 4 inch heavy duty provide storage space by elevating the bed with stackable option, and you can also stack them to 3 or 4 inch height Size of Sofa Risers: Adjustable bed risers base bed blocks: 4.75*4.75*4 inch(L*W*H). Groove depth: 0.65 inch. Actual lift height: 3 or 4 inch. The bed frame risers are only suitable for furniture legs smaller than 2.75 inch wide Material: These furniture risers 4 inch are made of heavy duty plastic, can withstand up to 2000lbs Wide Application: Bed lifts risers widely used in bed, desk, chair, sofa, cabinet, loft bed, crib, any furniture you want to raiser Include: You will be given a set of 4 table leg extenders raise your bed frame, which provide more space or make your under bed more easy to clean BTSD-home 4 pack Bed Risers 3 or 4 inch Heavy Duty Furniture Risers