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Could Forming Channel with Foam inside, H.D.G, Used for Connecting in Concrete.
The sizes contains as below:
28/15 x 100, 150, 200, 250, 350, 400, 550, 800, ...
28/15 x 100, 150, 200, 250, 350, 400, 550, 800, ...
49/30 x 150, 200, 250, 350, 400, 550, 800, ...
Cast-in Channel