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The difference between an add on unit and a free-standing wire shelf is that these units use posts on one end and is supported by an existing shelf using S-hooks. These units are perfect for creating corner shelving or extending the length of a freestanding unit.
Save on cost by getting rid of the posts and customize your space. By cutting out posts, you are also increasing the accessibility to the items stored on the shelf. If you're creating a corner unit, you will find that it is easier to get organized without an extra post blocking the way.