DEWALT DW3750-5 4-Inch 6 TPI Fast Wood Cut Cobalt Steel T-Shank Jig Saw Blade (5-Pack) Precision ground teeth stay sharper longer and deliver smooth, clean cuts Deeper gullets with increased free space remove more material for faster cutting T-shank design fits all Bosch and DEWALT jig saws Precision ground teeth stay sharper longer and deliver smooth, clean cuts Deeper gullets with increased free space remove more material for faster cutting Cobalt steel (bi-metal) maximizes blade life and durability T-shank design fits all Bosch and DEWALT jig saws