Task: Translation
Input (Czech): Hmo dinka (10) m  rozp rn  jaz² ky (14, 16), kter  jsou od sebe rozp rateln  zaÜroubov n m nezn zorn n ho Üroubu. Maxim ln  dosedac  plocha rozp rn²ch jaz² k  (14, 16) ve v²vrtu je dosa ena rozep°en m s rozm rov²m p°esahem vzhledem k pr m ru v²vrtu, p°i em  se rozp rn  jaz² ky (14, 16) p°i vsazen  do v²vrtu navz jem stla   a Üt rbiny (28) se do zna n  m ry uzav°ou.\
Output (English): The present invention relates to a dowel having expanding tongues (14, 16) that can be expanded apart by screwing in a screw (not shown). Maximum contact surface of the expanding tongues (14, 16) in a bore is achieved by expansion and dimensional overlap relative to the bore diameter, whereby the expanding tongues (14, 16), when being inserted into the bore, are compressed to each other and slits (28) close in considerable extent.