Thank all of u for the replies.
@valerostudio what do u mean by "the double diffuse trick in order to setup the UVW tiling" I always have some problems with UVW tiling setup, can u tell me about that trick?

Do u know how to make such a meterial in SP V-Ray?

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Now it works! Thank you for your help!

Thank u for the reply. I did what u had written but nothing happened. The problem appeared again. Any other ideas?

I have a problem with transparency rendering. At first i thought its a problem with my self-made material, but I downloaded perforated steel material from the internet and the problem appeared again.

My sketchup doesn't render full transparency and leaves glass like material in places where nothing should be. I have attached my rendered material and original material image.

I hope anyone of you can help me. Thank in advance for your help.