Shank Type: Taper Shank Taper Size: CAT50 Hole Diameter (Inch): 1 Nose Diameter (Inch): 2 Projection (Decimal Inch): 6.0000 Through Coolant: Coolant Through Clamping Depth (Decimal Inch): 4.4400 TIR (Decimal Inch): 0.0002 Coolant Type: Through-Spindle Retention Knob Thread Size: 1-8