• Shank Type: Taper Shank • Taper Size: BT30 • Hole Diameter (Inch): 1/4" • Nose Diameter (Decimal Inch): 0.79 • Projection (Decimal Inch): 2.36 • Through Coolant: Yes Now 3 Coolant Options All In One! • Coolant thru the spindle • DIN Coolant thru the flange option • Coolant thru the body • All Ground Body • Premium balanced to 30,000 rpm • Comes complete with certificate