This is a used drip tray made of non-magnetic stainless steel.
We do not know what it was used for.
The main tray measures 40x49.5" inside, and is tilted to drain into a 15.5" x 27.5" catch basin on the end.
The over all outside dimensions are 43-1/2" wide 70" long and 21" high.
The catch basin has a Removable strainer basket with 3/32" holes to filter out solids.
The catch basin has a 2" stainless drain valve.
The catch basin has some holes that originally led to pumps under the main tray, that have been removed. These will need to be plugged. The lowest of these holes that is not plugged/capped is 5-1/2" above the bottom.