Vortex Tool Series 3100M Two Flute Mortise Compression Spirals: the "Viper"

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This series of compression spirals is designed for doing mortise cuts or cutting material 5/8″ thick or less. Designed with a 1/4″ upcut or less, preventing chipping and fuzzing on top and bottom of the material being cut. “Mortise cuts” are grooves cut in the material usually at a depth equal to or slightly less than the diameter of the tool.