Loading... Please wait...O Flute, Upcut, Spiral Router Bits - (2 Flute) Solid Carbide - Vortex 5853. Cutting Edge Diameter 1/2 Cutting Edge Length 1 1/4 Shank Diameter 1/2 Overall Length 3. 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.