LEVELING SCREW CLAMP FIXED AND WON'T FALL DOWN You don't worry about 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 PROTECT YOUR FLOORS HARD FROM SCRATCHES The bottom of the solid sofa leg risers are made of high-density felt furniture pads. Bottom felt pads protect your floors from scratches. Sturdy and smooth edges would hold the weight securely without causing dents or cracks on hardwood or hard surfaces. Protect your hardwood, ceramic tile and linoleum floors from marks and scuffs