Best for achieving a smooth finish on laminate or veneer finish applications. cutting diameter: 1/4" cutting Height: 1" shank diameter: 1/4" overall length: 2-1/2" flutes: 3 compression bits cut down from the top of the stock and up From the bottom of the stock simultaneously. The bit's unique and complex geometry forces the trimmed material to be compressed toward the center of the stock leaving Behind a smooth & sharp finish free of chips on both the top and bottom edges. This bit can also be used for Mortising projects that require a smooth bottom surface without sacrificing the mortised edge finish.