Best for achieving smooth finish on Hard plastics. Cutting diameter: 1/8" Cutting Height: 1/2" Shank diameter: 1/4" Overall length: 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.