DEWALT DWA4179B25 9-Inch 10TPI 2X Reciprocating Saw Blade (25-Pack) Aggressive shank angle increases tooth contact, maintaining cutting speed as blade wears for longer blade life Patented tooth design utilizes shaper tooth geometry for faster cut rates Specially formulated anti-stick coating minimizes friction and gum-up for smoother cuts Taller high speed steel strip reduces breakage and maximizes tooth durability