Collet System Single Angle Collet Series TG150 Shank Type Taper Shank Taper Size CAT40 Projection Decimal Inch 6 DIN coolant thru the flange Shank traverse ground to obtain optimum accuracy Meets or exceeds ANSI specifications 00002 or better ensures the best possible cutting tool life Wrench not included Factory Balanced to save spindle life, tool life and increased productivity Threaded through holes for a backup screw tool stop or coolant through when removed CAT40 Premium balanced to 20,000 rpm CAT50 Premium balanced to 15,000 rpm