Each heavy-duty riser holds up to 500 pounds and raises furniture 3-1/4 inches * Special non-slip rubberized base * Padded top was designed to support furniture legs or casters 1 -1/4" - 3" in diameter * Slipstick recommends the CB605 (ASIN B000QYCNJG) be purchased if caster wheels are removed or the post is under 1-1/4" * Set of 4 (King size beds or center supported beds purchase 2 sets) Heavy-duty 3-inch bed risers come in a set of 4 and hold up to 2,000 pounds. Each riser comes with a special foam-pad top that contours to any style of post or castor wheel, up to 3 inches, to create a secure fit. The special non-slip rubberized coating on the bottom of each riser will prevent any scratches to your floors. These heavy duty risers can be used on any style of furniture to create extra space underneath your bed, dresser, night stand--almost anything that needs a little lift. Stop wasting space, and utilize every inch!