Solid Carbide End Mill 20mm 20R1x20-92x150xD20D1 (Cutting diameter): 20mm D3 (Undercut diameter): 18. 5 mm L2 ( Length of cut): 20mm L3 (Length of undercut): 92mm L1 (Total length): 150mm D2 (Shank diameter): 20mm Z (Number of cutting edges): 4 R Corner radius: 1 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.