How much weight can it hold?

600 lbs per shelf and 2,400 lbs total when it sits on the leveling feet. On the casters the whole rack is rated for 600 lbs total, so load it lighter if you plan to roll it.

Can I use it for food storage?

Yes. It holds NSF/ANSI Standard 2 certification, the food-equipment standard, and the zinc plating resists rust. Wire shelves suit dry goods and sealed containers better than loose small items.

Does it come with wheels or feet?

Both. The box includes four casters, two of them locking, and four leveling feet. Swap between them depending on whether you need it mobile or firmly planted.

How tall is each shelf gap?

The shelves sit on 1-inch posts and adjust to whatever spacing you set, so you can leave a tall gap for bins or split the 72 inches evenly across four tiers.

How does it compare with a chrome wire rack?

Same wire-shelf format and adjustability, but this one is zinc plated in black rather than chrome. Capacity on feet is high for the class; the caster rating is the main limit.