How to cut through steel c channel with 14in metal blade

Cutting out steel wrapping around the opening. Then we will block it in.
Where to get the blade? ...http://amzn.to/1WRYZbp you can get and try this one... http://amzn.to/1WRZ0fj
Where to get the saw....http://amzn.to/1TvBqSI or you can get this one...http://amzn.to/1WRZ9iP

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