04mm I.D. MAS/BT-30 GUHRING Hydraulic Chuck GuhrOJet HMC 3000 Peripheral Coolant Fed, 55mm Gage Length MAS/BT to DIN ISO 7388-2 form AD & AD/B | balanced to G2.5 / 25,000 RPM | tremendous clamping force | perfect concentricity < 3 um deviation at 10xD | quick, simple handling and accurate length setting (only from the front) | internal coolant through and GuhrOJET peripheral cooling ensures optimal chip evacuation and tool lubrication | for tool shank tolerance h6 | includes length adjustment screw | includes hexagon chuck key, Series no. 4912. Series No. 4620, Order Code 004.0300. Made in Germany, Guhring Part #9046200040300