Don’t care for these stacking tables at all and they are going back. They look cheap.  The material is bamboo or something like that, not wood. The color  has a displeasing yellow undertone.  I had no trouble putting them together.  You just need to be careful that both side pieces are positioned so that the holes will line up with the legs.  Put together with a regular phillips screw driver, they are sturdy.  I just cannot tolerate looking at 16 screws including 4 screws on the top surface.  Oh, these were made in China.