These are black steel computer stands on casters. They are fairly small, about 9-3/4" long, so for a big server-sized computer you might want to use two. They are 3-1/2" deep and are adjustable in width from 5" to 9-1/2". There are four sturdy plastic casters, two of them locking.
Somebody else's listing offers identical stands and identifies them as made by Syba. There are no identifying markings on the ones offered here.
There are two sets of pictures: one shows a stand adjusted to the maximum width, the other shows a stand adjusted to its minimum width. The pictures are of one stand; the others look identical.
I'm selling four of them, sold individually. I will combine shipping. doesn't do a good job of computing combined shipping, so if the actual cost is less I will refund any significant excess.
I have taken them apart to make shipping cheaper and easier. Expect to spend a half hour or so reassembling them.
They are made of thick steel and are heavy. Shipping is at cost (plus a nominal 75¢ handling fee).