Vortex - 3189 1/2" Cut Diameter Mortise Viper Compression Router BitUnique flute geometry allows the Viper to cut faster and longer than other compression spirals on the market today. Cut Diameter: 1 2" Shank: 1 2" Cut Length: 1" Overall Length: 3" Flute Type: Compression No. of Flutes: 2 Compression means the upcut and downcut spiral flutes compress the material being cut preventing chipping or fuzzing on the top and bottom of the cut. Our unique flute geometry allows the Viper to cut faster and longer than other