Upcut Chipbreaker, Spiral Router Bits - (3 Flute) Solid Carbide - Vortex 2070. Cutting Edge Diameter 5/8 Cutting Edge Length 2 1/8 Shank Diameter 5/8 Overall Length 4. Chipbreaker cutting edges break the chips into small pieces reducing power consumption and vibration. Chipbreakers are staggered on each flute to produce a smooth cut, but may leave visual lines on the part when used in router spindles in poor condition. The three flute design provides a better edge finish than a two flute tool at the same feed rate. Chipbreaker tools are recommended for hardwoods, plywoods, and dense materials where higher feed rates are required.