Amana - A51517 3/16" Cut Diameter Downcut Router BitThese Amana bits will produce clean, smooth cut edges in acrylic and other plastic materials. Cut Diameter: 3 16" Shank: 1 4" Cut Length: 5 8" Overall Length: 2" Flute Type: Downcut 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 Amana downcut router bits have a left hand spiral flute design which tends to push the material