These tools have a much shorter Up-cut section than the standard compression tools. They are ideal for Mortising grooving and dado.Our spektra bits feature a naco nanocomposite coating with an extreme nanohardness and heat resistance. With a brilliant distinctively-tinted coloring naco provides additional improvements in four critical aspects of router tooling.Naco coating is a micro-thin ceramic coating which enables the Tool's cutting edge to retain crucial sharpness and lubricity. This provides longevity and produces cutting results of the highest quality.Coating prevents high heat and oxidation which is detrimental to cutting tool performance.Multi-colored hues, while attractive, will dissipate upon use and yet coating will remain fully effective, #46020-K, (D) diameter: 3/8, (b) Cutting height: 1, (D) shank: 3/8, overall length (L): 3, B1: 3/16, flutes: 3, 46020-K CNC solid carbide spektra extreme tool life Coated mortise compression spiral 3/8 dia x 1 inch x 3/8 shank