Fox Valley Traders Oven Add-A-shelf, Black 

Oven AddAshelf, Black : This freestanding oven rack adds an instant shelf to your oven, allowing you to cook an extra dish while still leaving room to warm plates. Utilizing otherwise wasted space at the bottom of an oven, it's a great way to "cook smarter" and save energy and time, whether tossing in an extra batch of cookies, browning rolls or baking a side dish along with a big roast. The chromeplated stainless steel Oven AddAShelf sits at the base of the oven to add an extra shelf, and can store right in the oven when not in use. Oven shelf measures 13 1/2" L x 15" W x 1 3/4" H; fits ovens over 15"W and is safe up to 446F (avoid direct contact with oven element or flame). When you don't need an extra oven shelf, this ingenious design also works on the countertop, doubling as a handy cooling rack.