On Jun 6, 10:42*am, "MiamiCuse" wrote:

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Thanks Joe. *Is this one I can use:

http://www.northwaysmachinery.com/pr...emNumber=Wiss%...

That's the one in my tool box. It helps to drill a 1/4" hole to start
the cut with the center blade. On soft thin aluminum the center blade
can sometimes be forced into the work to start the cut. Double cuts
must never be used for close trimming or edge cuts. Their special use
is on sheet metal with a good bit of material on both sides of the
outer blades. They are the only way to get clean cuts away from the
ends of vent pipe. Have fun.

Joe