Solid Carbide End Mill 20mm 20R2x44-52x104xD20D1 (Cutting diameter): 20mm D3 (Undercut diameter): 19. 8mm L2 ( Length of cut): 44mm L3 (Length of undercut): 52mm L1 (Total length): 104mm D2 (Shank diameter): 20mm Z (Number of cutting edges): 6 R Corner radius: 2 Helical pitch: 40 6 cutting edges for best performance and an excellent material removal rate Optimized cutting edges and chip chambers to effectively prevent built up edges and chip stuck Ideal chip evacuation, even with high feed rates