This shelf is made of steel gratings( welded to angle steel). This one is used in our own office. You can put different things on different layer. Like the picture, we put fax machine on it.

Its advantage is it's small, very flexible, convenient, easy moving, and it can make full use of the limited space.

As for the size, we can satisfy your needs. It can be so small to put little things in office, meantime, it can be large enough to use in huge warehouse. The layers is also changeble according to your requirment.