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Does the thickness of metal determine the size of piercing blade?

When selecting a blade consider that the thicker the sheet, the thicker the blade.
 
If the blade is too thick for the metal it will just "catch" on the metal.
 
If the blade is too thick for the metal it will take a lot longer to cut and is more likely to snap. 
 
As a rough guide you would want to aim for 2-3 teeth on the blade to the thickness of the metal, 
although if in doubt go for 2/0 or 3/0 blades.