• Features:• Maintaining ventilation of the bottom of the objects, anti-moisture, anti-rust and easy to be moved and cleaned.• Main Material: Pa66, rubber universal wheels, metal stainless steel.• Function: smooth and firm, adjustable dimension and convenient movement.• Quality: Ultra-Strong riginess, press resistance and anti-corrosion.• Height: 9CM.• Maximum Load: 138KG.• Unfold size: 660 X 660 Minimum size: 435 X 435 MM• Direction for Use:1. Cutting off the scale that is printed in packing box and measuring the distance between four bases at the bottom of the object.• Pulling out equally four corners centered on red line and tightening the screw cap.• Brake wheel stays in front side, which is convenient to be moved and fixed.• Releasing brake devices when moving and clamping brake devices when tightening.• The valid length of the product is 56 X 56 CM. If the length surpasses the valid length, it will influence the use quality.• Application: Suitable for placing heavy objects such as washing machine, refrigerator, sterilizing cabinet and air-conditioner.