Shrink Fit Tool Holder and Adapter Hole Dia 12.00mm Taper Size CAT50 Shank Dia 12.00mm Projection 203.00mm Nose Dia 24.00mm Coolant Fed Coolant Through Balanced to RPM 25 000 RPM For Use With Quick Change Chuck Attachment Converts an Impact Driver into a Drill Fits All Round Shank Bits Includes 1/4 in Hex Bit Adapter