HARD PLASTIC MATERIALStrong hard plastic adjustable furniture risers, which can handle the weight of the heaviest furniture in your home or office, can safely support up to 20,000 lbs. They won't creak like other risers. High-density felt furniture pads protect your hardwood, ceramic and linoleum floors from scratches and scuffs LEVELING SCREW CLAMP FIXED AND WON'T FALL OFFYou won't worry about the bed risers falling off. The adhesion of other furniture risers is not enough, it is easy to fall off. To solve this problem, we have improved the adjustable furniture risers with a screw clamp. 3cm grooves sink, moving 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 ADJUSTABLE CHAIR LEG WIDTH- 2 inch bed and furniture risers fit diameter of round legs or squares from (22 mm / 0.8 inch to 42 mm / 1.6 inch). The total height: 83 mm / 3.3 inch, actual height increased: 52 mm / 2 inch, side length: 52mm/2inch. Increased Groove Protection: 30mm/1.18inch. WARM TIPS: Not suitable for legs with width less than 22mm (0.8 inch) and not suitable for legs with width greater than 42mm (1.6 inch). REMARK : NOT SUITABLE FOR CURVED OR RECLINING CHAIRS, ONLY FOR RIGHT ANGLE CHAIRS INCREASED ADDITIONAL HEIGHT- Adds extra height not only for storage space under beds but also extra height allowing vacuum cleaners or robot vacuum cleaners to operate more flexibly. 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, armchairs, tables, sofas and other heavy stationary furniture, avoiding shoulder and neck pain caused by low furniture height