4U50 Shallow pitch rougher. 4–6 flutes with variable spacing. Short length of cut and 3 x D diameter neck length. Stainless steel and high-temp alloys. Centre cutting. NEW! 4U80 Shallow pitch rougher. 4–6 flutes with variable spacing. Regular length of cut. Stainless steel and high-temp alloys. Centre cutting. NEW! New Weldon® shank widia.com