Amana - A51636 4mm Cut Diameter Upcut Router BitThese Amana bits will produce clean, smooth cut edges in acrylic and other plastic materials. Cut Diameter: 4mm Shank: 4mm Cut Length: 12mm Overall Length: 64mm Flute Type: O Flute Upcut No. of Flutes: 1 The bits are made according to strict tolerances from an exclusive high quality carbide grade and polished to a mirror finish using Amana's unique process. The upward spiral geometry will eject chips up out of the cut where they can be collected by a