Two of Diamonds. To cut cast-iron pipe cleanly and quickly with a reciprocating saw, it's best to use diamond grit blades, says Lenox. And Diamond Double Tang blades last twice as long as single tang blades, says the company, because they can be reversed when one side wears out. They're sold in 9- and 11-inch lengths for list prices of $14 and $17. Lenox, 800/628-8810.

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