*Application: suitable for placing heavy object such as washing machine,refrigerator. *Features: maintaining ventilation of the bottom of the objects, anti-moisture, anti-rust and easy to be moved and cleaned. *Material: Pa66, rubber universal wheels, metal stainless steel. *Function: smooth and firm, adjustable dimension and convenient movement. *Quality: ultra-strong rigidness, press resistance and anti-corrosion. *Height: 9cm. Maximum load: 200kg. *Unfold size: 660x660mm *Minimum size: 435x435mm