A metering head for a metering machine having a carrier having parallel attachments for picking up pipette tips, wherein each attachment has: a tube having a supporting protrusion at the bottom end, at least one sleeve which surrounds the tube and can be axially shifted on the tube, and at least one elastomer O-ring which surrounds the tube, a pressure plate above the sleeves having a plurality of first holes through which the tubes extend, wherein the pressure plate can be shifted along the tubes from a release position into a clamping position where the sleeves are pressed, at the bottom ends, against the adjacent O-rings, and the O-rings are expanded to clamp pipette tips; and a first shifting apparatus connected to the pressure plate moving the pressure plate between the release position and clamping position.