Solid Carbide End Mill 8mm 8R0.5x9-27x63xD8D1 (Cutting diameter): 8mm D3 (Undercut diameter): 7. 4mm L2 ( Length of cut): 9mm L3 (Length of undercut): 27mm L1 (Total length): 63mm D2 (Shank diameter): 8mm Z (Number of cutting edges): 4 R Corner radius: 0. 5 Helical pitch: 30 Unequal tooth pitch and variable helical pitch for smooth running Specially designed cutting edge geometry for contour machining Optimized chip chambers for safe evacuation of the chips Radius tolerance r 1. 5 mm: 0. 003