Best for achieving smooth finish on hard plastics. Cutting Diameter: 1/4" Cutting Height: 1" Shank Diameter: 1/4" Overall Length: 2-1/2" Flutes: 3 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 end mills direct chips up and away from the milling area leaving an unobstructed path for the end mill. Bit breakage is less likely.