A metering head for a metering machine or another metering device comprising: • at least one attachment having the following features: • a tube which has a supporting protrusion at the bottom end that protrudes outward and extends peripherally at least partially, • at least one sleeve (32, 38) with a peripheral tapering (33, 39) at the bottom end which surrounds the tube and can be axially shifted on the tube, • at least one elastomer O-ring (31, 37) which surrounds the tube and is arranged adjacent to the tapering (33, 39), and • the sleeve (32, 38) can be shifted between a release position at a first distance from the supporting projections and a clamping position at a second distance from the supporting projections that is smaller than the first distance; in the clamping position, the sleeve (32, 38) with the tapering is pressed into the adjacent elastomer O-ring, and the elastomer O-ring (31, 37) is expanded in order to securely clamp the pipette tip shoved onto the attachment, characterized by • a carrier on which a plurality of parallel attachments for picking up pipette tips are arranged adjacent to each other, • a stop plate that has a plurality of first holes through which the attachments extend, • a first shifting apparatus that is coupled to the sleeves (32, 38) of all the attachments, and is designed to shift the sleeves (32, 38) between the release position and clamping position, • a second shifting apparatus that is connected to the stop plate and is designed to shift the stop plate between a stop position at a first distance from the supporting projections and an ejection position at a second distance from the supporting projections that is smaller than the first distance in order to shove pipette tips on the attachments in the stop position until contacting the stop plate, and to eject them from the attachments by shifting the stop plate from the stop position to the ejection position, • wherein the second shifting apparatus comprises rocker arms that are pivotably mounted on the carrier, transmission shafts that are coupled to the sleeves (32, 38) and each contact one end of a rocker arm, and ejection shafts which are securely connected to the stop plate and each lie against another end of a rocker arm so that when the sleeves (32, 38) are shifted into the release position, the transmission shafts pivot the rocker arms, and they press the stop plate via the ejection shafts out of the stop position into the ejection position. • at least one attachment having the following features: • a tube which has a supporting protrusion at the bottom end that protrudes outward and extends peripherally at least partially, • at least one sleeve (32, 38) with a peripheral tapering (33, 39) at the bottom end which surrounds the tube and can be axially shifted on the tube, • at least one elastomer O-ring (31, 37) which surrounds the tube and is arranged adjacent to the tapering (33, 39), and • the sleeve (32, 38) can be shifted between a release position at a first distance from the supporting projections and a clamping position at a second distance from the supporting projections that is smaller than the first distance; in the clamping position, the sleeve (32, 38) with the tapering is pressed into the adjacent elastomer O-ring, and the elastomer O-ring (31, 37) is expanded in order to securely clamp the pipette tip shoved onto the attachment, • a carrier on which a plurality of parallel attachments for picking up pipette tips are arranged adjacent to each other, • a stop plate that has a plurality of first holes through which the attachments extend, • a first shifting apparatus that is coupled to the sleeves (32, 38) of all the attachments, and is designed to shift the sleeves (32, 38) between the release position and clamping position, • a second shifting apparatus that is connected to the stop plate and is designed to shift the stop plate between a stop position at a first distance from the supporting projections and an ejection position at a second distance from the supporting projections that is smaller than the first distance in order to shove pipette tips on the attachments in the stop position until contacting the stop plate, and to eject them from the attachments by shifting the stop plate from the stop position to the ejection position, • wherein the second shifting apparatus comprises rocker arms that are pivotably mounted on the carrier, transmission shafts that are coupled to the sleeves (32, 38) and each contact one end of a rocker arm, and ejection shafts which are securely connected to the stop plate and each lie against another end of a rocker arm so that when the sleeves (32, 38) are shifted into the release position, the transmission shafts pivot the rocker arms, and they press the stop plate via the ejection shafts out of the stop position into the ejection position.