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4mm Germany KELCH brand Shrink Fit, Shrinker CAT40 metric end mill holder 4mm(ID diameter) x 12mm(nose end diameter) x 70mm(Gage Length) * Maximum 0.0002" TIR or better. * Balanced to G2.5/25000RPM. * 360 degree tool grip along the entire length of bore resulting in an evenly distributed clamping force and superior concentricity. * Ideal for end milling, drilling and other critical rotary tool applications. * No need wrenches, Collets, set screws and other accessories. * Coolant thru. * 5/8"-11 thread