This is a great divider for my shelf, giving me better storage stackability.  It locks or attaches to the existing shelf well.  The one flaw is that the sides do not lock to the top shelving piece.  They just sit or balance there.  I wired them to keep them from lifting off when moving items  on the shelf.

Pros: Sturdy and locks to existing shelf nicely.
Cons: The one flaw is that the sides do not lock to the top shelving piece.  They just sit or balance there.  I wired them to keep them from lifting off when moving items  on the shelf.