For standard CNC milling and routing for challenging materials where material removal and efficiency is required Premium C3 micro-grain solid tungsten carbide for a high-performance industrial quality tool "For use on CNC, table mount and handheld routers" Polished to a mirror finish from a solid carbide rod for precision & accuracy Best for achieving smooth finish on hard plastics. Cutting Diameter: 1/4" Cutting Height: 1-1/2" Shank Diameter: 1/4" Overall Length: 3" Flutes: 2 Low Helix bits perform a more lateral movement with less lift resulting in a smoother finish. These bits are a better choice for hard plastics such as acrylic and phenolic. Up-cut endmills direct chips up and away from the milling area leaving an unobstructed path for the endmill. Bit breakage is less likely.