DEWALT DW3774-5 3-Inch 18TPI Medium Metal Cut Cobalt Steel T-Shank Jig Saw Blade (5-Pack) Unique curved tooth design minimizes stress points for longer blade life and faster cuts Cobalt steel (Bi-Metal) maximizes blade life and durability T-shank design fits all Bosch and DEWALT jig saws Unique curved tooth design minimizes stress points for longer blade life and faster cuts Cobalt steel (Bi-Metal) maximizes blade life and durability T-shank design fits all Bosch and DEWALT jig saws