Description Spyder Bore Blade 10 TPI top/7 TPI bottom ? general purpose/wood 10? Pkg/3 Plunge cut through gypsum board without rattling your teeth. With its rounded tip and a double-edged blade for multidirectional cuts, the Spyder Bore-Blade reciprocal saw attachment will save you time and make your job . Fits all reciprocating saws. Double-edge blade allows multi-directional cuts without flipping your saw over, Rounded tip with teeth allows plunge cuts and eliminates the need for pilot holes,.Made from 1.23 mm thick bi-metal steel