Cut through thin and medium metals quickly with the Lenox 6" x 18 TPI, Bi-Metal Reciprocating Saw Blade (25 Pack (20529-B618R). Power Blast Technology high-speed blasting along the cutting edge strengthens the blade to reduce breaks and increase durability. T2 Technology tooth geometry reduces cutting forces on each tooth and optimizes chip removal to allow efficient cutting in the widest range of materials. The result is a much faster cut and prolonged blade life, so you can spend more time cutting and less money on blade replacements.