DEWALT DW4869 9-Inch 18TPI Demolition Bi-Metal Reciprocating Saw Blade (5-Pack) Patented tooth design utilizes sharper tooth geometry for faster cut rates Aggressive shank angle increases tooth contact, maintaining cutting speed as blade wears for longer blade life Taller high speed steel strip (tallest in the industry) reduces breakage and maximizes tooth durability Specially formulated anti-stick coating minimizes friction and gum-up for smoother cuts