Baker’s racks were particularly popular in home kitchens during the 1980s and 1990s and remain widely available today. A previous owner who valued organised kitchen storage would have had clear reasons to invest in one.
The third option: a spare oven rack or wall oven component left behind
The third possibility is the simplest: the item may be a spare oven rack or a component from a wall oven that was removed during a renovation and never reinstalled. Oven racks are sized to fit snugly inside a standard oven cavity, which means they naturally match the interior dimensions of the appliance.

Previous owners sometimes store extra racks, broiler trays, or oven accessories in a kitchen cupboard or utility area and forget them when moving out. In homes where a wall oven was replaced or reconfigured, a rack from the old unit can easily be left behind.
Checking whether the rack slides cleanly into the existing oven is the quickest way to confirm or rule out this explanation. If it fits, the mystery is solved in seconds.
For anyone who has just found this type of rack and wants a definitive answer, the next step is straightforward: measure the width and check for caster wheels. If it rolls and measures around 26 inches across, it is almost certainly a commercial speed rack — and a potentially useful one. If it fits inside the oven, it belongs there. What remains less clear, without a photo, is whether the item is the original third candidate — a wall oven component — which would require matching it against the specific oven model present in the home.

