These are about worth what I paid for them. They are metal and painted but the paint interferes with assembly and they were rusting before they ever came out of the box. 

The paint interferes with the sliding of one part onto another and its challenging to wear it down so that parts fit and the screw can be placed. 

The cross pieces which hold a nut that receives the screw comes undone easily making the entire assembly very fragile.

All in all, if you need a trellis for a protected spot, they may be the bargain for you. But it is not appropriate for an outdoor space.