Spyder 200009 7 by 10 TPI Bore-Blade Universal Blades fit all reciprocating saws 8-Inch - 7TPI (bottom)/10TPI (top) - Wood general purpose Blade Additional reversed tooth configuration on top of the blade. enables cuts on both the push and pull motion for more efficient cuts Double-edged, 1.23mm thick, bi-metal steel blade allows multi-directional cuts without flipping your saw over saving time and energy Rounded tip with teeth allows plunge cuts eliminating the need for pilot holes