These 4" tall risers raise beds and furniture height by 3 inches, adding extra storage space underneath and making cleaning easier. They securely lock in casters, bed wheels, bed posts, and furniture feet up to 3 inches round or 2-1/4 inches square thanks to a 1-inch deep recessed holder cup with a built-in memory foam cushion pad. The heavy-duty design includes a steel-reinforced plate to prevent furniture legs from puncturing through, making them ideal for heavy furniture. Each riser supports 660 pounds, with the set of 4 supporting a total of 2,640 pounds. The base features 3 rubber grips to protect floors and prevent sliding. Note that the furniture legs must fit within the 3" round recessed holder top. While the riser height is 4", the actual raise height provided is 3" due to the recessed holder cup.