That could be a dozen differant things your talking about, got a picture or web site?
If it's something like expanded metal I'd be contacting some local steel supplyers.
Should be under steel in the phone book.
If you want chase grating, you'll need a local metal supplier....... who will add shipping to his price. There are lots of different sizes, depending on what load it needs to bear. Thickness of the bar x depth x spacing
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