Shank Diameter -.0001 to -.0003" Cutter Diameter 3/16-1/4" +.000-.002" 5/16-1" +.000-.003" T.I.R. Maximum .0005"Neck diameter reduced .020" on all sizes for required clearance in long reach applications.Metric sizes also ......Shank Diameter -.0001 to -.0003" Cutter Diameter 3/16-1/4" +.000-.002" 5/16-1" +.000-.003" T.I.R. Maximum .0005"Neck diameter reduced .020" on all sizes for required clearance in long reach applications.Metric sizes also from stock.