DEWALT DW4847 6-Inch 5/8 TPI Taper Back Bi-Metal Reciprocating Saw Blade (5-Pack) Reinforced tooth for increased durability when cutting through nails and other foreign objects +6 degree hook angle for fast, aggressive cuts Specially formulated anti-stick coating minimizes friction and gum-up for smoother cuts Raker tooth design increases the tooth contact area for faster cuts Reinforced tooth for increased durability when cutting through nails and other foreign objects 6 degree hook angle for fast, aggressive cuts Specially formulated anti-stick coating minimizes friction and gum-up for smoother cuts Raker tooth design increases the tooth contact area for faster cuts