Collet System Single Angle Collet Series SA10 Shank Type Taper Shank Taper Size CAT50 Projection Decimal Inch 413 DIN Coolant thru the flange at no extra charge Run out accuracy is 5 Micron at 4xD of the cutting tool shank 8Deg tapered collet seats deeper in the body of the holder providing increased rigidity This results in concentricity and stronger gripping power Each chuck comes with a collet extractor Complete with certificate CAT40 Premium balanced to 20,000 rpm CAT50 Premium balanced to 15,000 rpm