All shell mill holder are manufactured according to DIN 69893. Balanced to G 6.3 - 12,000 RPM. Used on machining centres, milling machines, turning machines special machines with automatic tool change. Central, axial coolant supply through coolant tube. Torque transmission via two key slots at end of taper. Two slots on collar for tool magazine, location edge. Hole for data carrier DIN 69873 in collar.