HARD PLASTIC MATERIAL: Heavy duty hard plastic adjustable furniture risers, can hold the weight of the heaviest furniture in your home or office, can safely hold up to 20,000 lbs. They don't squeak like other risers. High-density felt furniture pads protect your hardwood, ceramic, and linoleum floors from scratches and scuffs Leveling screw clip secure and won't fall off: You don't have to worry about the bed riser falling off. The adhesion of other furniture risers is not enough, and it is easy to fall off. To solve this problem, we have improved the adjustable furniture riser with screw clamp. The 3 cm groove sinks and the movement will not tilt. Use screw clips to adjust and fix, and the wrapped furniture legs are not easy to fall off. Easy to install adjustable sofa/sofa/table/desk. Adjustable chair leg width: - 2 inch bed and furniture risers fit round or square leg diameters (22mm/0.8inch to 42mm/1.6inch). Total height : 83 mm / 3.3 inch, actual added height: 52 mm / 2 inch, side length: 52mm / 2 inch. Additional Notch Protection: 30mm/1.18inch. Warm reminder: Not suitable for legs whose width is less than 22mm (0.8 inches), or legs whose width is more than 42mm (1.6 inches). NOTICED : Does not fit curved or reclining chairs, only right angle chairs Add extra height: - Not only add extra height for under bed storage space, but also add extra height for vacuum cleaner or robot vacuum for more flexible operation. They also make it easier for the elderly to get in and out of bed. Raise the height of heavy stationary furniture such as beds, sofas, chairs, tables, sofas, etc. of 2/4 inch to avoid shoulder and neck pain caused by low furniture height Protect your hard floors from scratches: The bottom of the solid sofa legs are made of high-density felt pads. Bottom felt pads protect your floors from scratches. Strong and smooth edges can hold weight firmly withou