OPEN SPACES Entryway Rack Assembly Instructions Manual page 4

Step 4: Fold cardboard insert into a square and fit the mini flaps into corresponding slots
Step 5: Use the cardboard insert to position the shelf at the correct height
Step 6: Slide the shelf over the uprights to align with the lower set of holes
Step 7: Use allen key to secure with 2 bolts (M5 x 30) on each side of the shelf
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Open Spaces | Entryway Assembly Instructions Page 4