Internal Tool 64-6940-C Chamfer Mills; Cutter Head Diameter (Fractional Inch): 1/2 ; Cutter Head Diameter (Decimal Inch): 0.5000 ; End Type: Single ; Shank Diameter (Decimal Inch): 0.5000 ; Shank Diameter (Inch): 1/2 ; Shank Length (Decimal Inch): 5.