Loading... Please wait...O Flute, Downcut, Spiral Router Bits - (2 Flute) Solid Carbide - Vortex 5985. Cutting Edge Diameter 8mm, Cutting Edge Length 25mm, Shank Diameter 8mm, Overall Length 64mm. Developed for cutting harder plastics, such as acrylic, at faster feed rates with a smooth finish. Ideal for CNC applications. Choose upcut for upward chip removal or downcut for better part hold down.