Internal Tool 64-1205 Chamfer Mills; Cutter Head Diameter (Fractional Inch): 3/8 ; Cutter Head Diameter (Decimal Inch): 0.3750 ; End Type: Double ; Shank Diameter (Decimal Inch): 0.3750 ; Shank Diameter (Inch): 3/8 ; Shank Length (Decimal Inch): 2.29