Best for achieving smooth finish on hard plastics. Cutting Diameter: 1/8″ Cutting Height: 1/2″ Shank Diameter: 1/4″ Overall Length: 2″ 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 end mills direct chips up and away from the milling area leaving an unobstructed path for the end mill. Bit breakage is less likely.