Welcome to our store HARD PLASTIC MATERIALAdjustable furniture risers made of strong and durable PA6, which can withstand the weight of the heaviest furniture in your home or office, they can safely support up to 500kg. They won't creak like other risers. High-density felt pads protect your hardwood, ceramic and linoleum floors from scratches and scuffs LEVELING SCREW CLAMP FIXED AND WON'T FALL DOWN worry about the bed risers falling off. The adhesion of other chair boosters is not enough, it is easy to fall off. To solve this problem, we upgraded the adjustable bed risers with a screw clamp, the move will not tilt. Use a screw clip to adjust the fixing, wrapped furniture legs are not easy to fall off. Adjustable sofa/sofa/table/desk risers are easy to install. Step 1). Clean the table leg and keep it dry. Step 2). Align the chair legs in the center. Step 3). Use hex screw to lock ADJUSTABLE CHAIR LEG WIDTH- 4 inch bed and furniture risers fit round or square leg diameter from (0mm/0inch to 37mm / 1.5 inch). The total height: 134 mm / 5.3 inch, actual height increased: 103 mm / 4 inch, side length: 52mm/2inch CREATE USABLE SPACE- Adds extra height not only for storage space under beds, but also extra height for vacuum cleaners or robot vacuums to work conveniently more flexible. They also make it more convenient for seniors to get in and out of bed. Raise the height by 2/4 inches on beds, sofas, chairs, tables, sofas and other heavy stationary furniture, avoiding shoulder and neck pain caused by low furniture height