【HARD PLASTIC MATERIAL】Adjustable furniture risers made of durable and strong hard plastic, which can support the weight of the heaviest furniture in your home or office, it can safely hold up to 20,000 lbs. They won't creak like other risers. High-density felt pads protect your hardwood, ceramic and linoleum floors from scratches and scuffs 【UPGRADE SCREW CLAMP FIXED & NOT FALLING OFF】You don't worry about the bed risers falling off. The grip of other chair risers 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 fixation, the wrapped furniture feet are not easy to fall off. Adjustable Sofa/Couch/Table/Desk Risers are easy to install. Step 1). Clean the table leg and keep it dry. Step 2). Align the chair legs to the center. Step 3). Use a hex screw to lock 【ADJUSTABLE CHAIR FEET WIDTH】- 4 inch bed and furniture risers fit round or square leg diameter from