used as a reinforcement (for concrete floors)

In situ concrete slabs are built on the building site using formwork - a type of boxing into which the wet concrete is poured. If the slab is to be reinforced, the rebars are positionined within the formwork before the concrete is poured in. Plastic tipped metal, or plastic bar chairs are used to hold the rebar away from the bottom and sides of the form-work, so that when the concrete sets it completely envelops the reinforcement.

For a ground slab, the form-work may consist only of sidewalls pushed into the ground. For a suspended slab, the form-work is shaped like a tray, often supported by a temporary scaffold until the concrete sets.

The formwork is commonly built from wooden planks and boards, plastic, or steel. On commercial building sites today, plastic and steel are more common as they save labour. On low-budget sites, for instance when laying a concrete garden path, wooden planks are very common. After the concrete has set the wood may be removed, or left there permanently.

in general
and more opt. > www.alibaba.com

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Note added at 26 mins (2010-02-23 14:55:29 GMT)
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http://www.ferrosit.cz/hutni-material/svarovane-site.php

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Note added at 1 hr (2010-02-23 16:03:28 GMT)
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It would be fair to mention that these "KaRI site" are ALWAYS delivered in "sheets" of varous dimensions. The most common one is 2 x 3 m (6 m2). That is why I use "SHEET".