ADJUSTABLE CLAMP MOUNTING SYSTEM: These 10cm adjustable furniture lifters are designed to fit round or square legs with a diameter of 30-60mm. They clamp directly onto furniture or without drilling, thus maintaining the integrity of your furniture. AND STURDY MATERIAL: Each lifter is made of , strong hard plastic that not break under pressure, and each leg can support over 50,000 pounds. The bottom of the lifter also features felt pads to protect your floors from scratches, increasing durability and functionality. ADDITIONAL STORAGE SPACE: By raising furniture by 10cm, these lifters not only create extra storage space under beds and other furniture, but also make them easy to clean with a vacuum cleaner or robot vacuum, thus increasing the practicality and cleanliness of your living space. COMPATIBILITY NOTE: Please note that these bed lifters are not suitable for furniture with angled legs. They are designed for furniture with right-angle legs to stability and a secure fit.