Solid Carbide End Mill 6mm 6x20-25x63xD6D1 (Cutting diameter): 6mm D3 (Undercut diameter): 5. 8mm L2 ( Length of cut): 20mm L3 (Length of undercut): 25mm L1 (Total length): 63mm D2 (Shank diameter): 6mm Z (Number of cutting edges): 7 Helical pitch: 39 Slightly conical tool core and special helical pitch 7 specially finished cutting edges with optimized geometry Face Finish bevel for smooth workpiece surfaces For excellent surfaces and maximum dimensional accuracy 7 cutting edges for highest