The invention relates to a device for attaching two add-on parts (36, 37) to a carrier part (35), said device having an outer clamp (1) and an inner clamp (11) that arrests any movement of the outer clamp (1), said clamps being insertable, in an interlocked arrangement, into a single insertion opening configured in the carrier part (35) so as to hold not only an add-on part (37) that is movable relative to the carrier part (35), but also the additional add-on part (36), on the carrier part (35) with a high extraction force for each.