I knew I was buying a cheap shelf unit so my expectations weren't very high. Still, I found inconsistencies in where the holes were drilled to insert the bolts - so some poles connected more snugly than others. Some holes were slightly askew making it difficult to align with the cross pieces. Also, many of the internal nuts were not set properly so many times I ended up cross threading the bolts and having to try again and again and again to secure. The entire unit when completed is just not stable enough to be trustworthy in my home.