【Adjustable Furniture Dolly】: Double-row design, simple in structure and installation-free. The length can be easily extended from 17-1/2 inches to 28 inches, giving you enough freedom to apply this washing machine dolly to small or medium-sized furniture such as refrigerators, washing machines, washer and dryer, mini-fridges, etc. Please ensure the dimensions match your intended items. 【Upgraded Appliance Wheels】: Each set of heavy-duty appliance wheels is equipped with 24 polypropylene wheels, increased contact area between the moving wheels and the floor, allowing you to use little force to move the refrigerator or washer and dryer smoothly. Please note that the wheels cannot rotate 360°, they can only move forward or backward. 【Specially Designed Mobile Base】: The height of the mobile washing machine base is 1-1/2 inches, providing stable support while meeting your daily use. This mobile washing machine base can easily lift your furniture from the floor, keeping the bottom of the washing machine dry and ventilated, effectively extending its service life. In addition, it is convenient for you to clean the bottom of the washing machine and keep the floor clean.