Solid Carbide End Mill 12mm 12x51-56x100xD12D1 (Cutting diameter): 12mm D3 (Undercut diameter): 11. 5mm L2 ( Length of cut): 51mm L3 (Length of undercut): 56mm L1 (Total length): 100mm D2 (Shank diameter): 12mm 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