Direction for use:
1. cutting off the scale that is printed in packing box and measuring the distance between four bases at the vottom of the object
2. pulling out equally four corners centered on red line and tightening the crew cap
3. brake wheel satys in front side, which is convenient to be moved and fixed
4. releasing brake decices when moving and clamping brake devices when tightening
5. the valid length of the product is 80x80cm, of the length surpasses the valid lenth, it will influence the use quality.