Amana tool 51731-K Spektra Extreme tool Life Coated SC Spiral Finisher 1/4 Dia x 7/8 Cut Height x 1/4 Shank x 3 Inch Long x 3 Flute Down-Cut Router Bit, Leaves an Extra High Surface Finish

Leaves an Extra High Surface Finish Those seeking improved surface finishes in either plastic, woods and other materials would do well by using Amana Tool's 3 flute, Low Helix Finishers. The unbeatable combination of three keen edges and a gentle 10° helix equates to a stiffer tool that minimizes both part movement and edge burring, leaving a smooth finish.  Low Helix Up-Cut and Down-Cut Leaves an Extra High Surface Finish 3 Flute (unless noted otherwise, item #51734-K is 2-flute)Excellent for Cutting: PlasticAcrylic StoneAcrylonitrile Butadiene Styrene (ABS)CorianComposite PlasticCoroplast*DelrinFoamFomexHardwoodHigh Impact Polystyrene (HIPS)High Pressure Laminates (HPL)Hydroxy-Terminated Polyether (HTPE)Low Density Polyethylene (LDPE)LubXPerspex Cast Acrylic SheetPoly (methyl methacrylate) (PMMA)Polyethylene Terephthalate Glycol-Modified (PETG / PET-G)Polyoxymethylene (POM), also known as Acetal, Polyacetal and PolyformaldehydePrecision BoardSign FoamSoftwoodSolid SurfaceStarBoard (King StarBoard 'R') High Density Polyethylene Sheet (HDPE)Thermoplastic Polyolefin (TPO)Urethane*Coroplast is soft plastic cardboard made with super soft, super flexible PVC. 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.nACo offers approximately 4,500 Vickers for impressive solid hardness on cutting areas of the tool, for an increase up to 2.5 times compared to uncoated bits.Note: Blue based color dissipates immediately upon use. nACo nanocomposite coating will not wear off.