Quenching slabs with holes in them - GIF

Quenching slabs with holes in them. No, it's not as cool as the Panzer tank hull being quenched. But still quench-worthy. I like how the cameraman backs up at the end.

<video controls autoplay loop>
<source src="https://diqn32j8nouaz.cloudfront.net/quenching_slabs_with_holes.mp4" type="video/mp4">
Your browser does not support the video tag.
</video>


Previously:

https://www.homemadetools.net/forum/...2504#post96473
https://www.homemadetools.net/forum/...473#post122635
https://www.homemadetools.net/forum/...492#post122734
https://www.homemadetools.net/forum/...3582#post99502
https://www.homemadetools.net/forum/...213#post121319
https://www.homemadetools.net/forum/...158#post100892

I am counting what looks like 6 individual slabs. It seems the center slabs would cool at a much slower rate than the ones on the top and bottom.

Might be saline vs fresh water. Anyway, I'm sure they are floor plates or Acorn type platens. Each Acorn [no longer in production] seen was square but https://www.weldsale.com/product-cat...latens-stands/ plenty of sizes are available.
Most floor plates are T-slotted, or matrixed with tapped holes for use with machine tools; BIG machine tools.