HIGH QUALITY MATERIALS:The set of 4 adjustable bed legs are made of durable and sturdy hard plastic to support the weight of even the heaviest furniture in your home or office and safely support up to 2000 kg (4400 lbs). They don't squeak like other bed risers. High-density felt bottom rails protect your hardwood, ceramic, linoleum and carpet floors from scratches and scuffs. Table Leg Risers with Screw Clamps:The other table leg risers stool do not have enough grip and fall easily. To solve this problem, we have improved the height of the adjustable bed with screw clamps. Use screw clips to adjust and fix, and the wrapped furniture legs are not easy to fall off. Adjustable width:4 inch Riser chair legs. Suitable for round or square legs with a width of 22mm/0.8" to 42mm/1.6". Actual height: 103mm/4in. NOTICED : Not suitable for angled furniture legs. CREATE USEFUL SPACE:Not only provides storage space under the bed, but also provides extra height for the vacuum cleaner or robot vacuum to work from more flexible way. They also make it easier for older people to get in and out of bed. Raise the height of heavy stationary furniture such as beds, sofas, armchairs and tables by 100mm to avoid shoulder and neck pain caused by low furniture height.