Attributes . 16.5 Degrees Lead Angle Redistributes Cutting Forces in the Spindle Z-Axis Direction, Durable Cutting Edges Qualified to Machine a Wide Range of Materials, Greatly Reduces Tool Deflection and Vibrations for Improved Tool Life, Suitable for Long Tool Reach, Unique Integrated Radial Wiping Facet to Achieve a Nice Wall Finish at Pocket and Helical Interpolation Milling, WS40PM Best In Class Milling Grade for Machining Stainless Steel and HTA . Names