Solid Carbide End Mill 20mm 20R0.5x60-74x126xD20D1 (Cutting diameter): 20mm D3 (Undercut diameter): 19. 4mm L2 ( Length of cut): 60mm L3 (Length of undercut): 74mm L1 (Total length): 126mm D2 (Shank diameter): 20mm Z (Number of cutting edges): 4 R Corner radius: 0. 5 Helical pitch: 40 Extra stable tool core with a slightly conical shape Optimized roughing teeth for soft cut and small chips Special unequal tooth pitch paired with variable helical pitch Also ideally designed for trochoidal milling