I have two of these. Both for $30 or one for $20.

Heavy-duty chrome sliding shelf for cabinets. Fits 15" wide opening and wider. 21" deep and 5.25" tall. They can be used in kitchen, bathroom, shop, garden sheds or wherever you need access to deep cabinets.

It did not fit the width of my cabinet so I don't need it anymore. High quality with full extension slides. I have seen these in stores for $75 to $100.

I have 2 of these. Buy one for $20 or take both for $30.