The subject innovation is to install the various kinds of buildings during construction the top plate, heat exchange equipment, insulation, insulation, etc. yitorok portion for being embedded in the slab part discloses a slab insert for which dolseol. Slab insert for the subject innovation disclosed in the insert having an engaging portion and a shaft seal and nagwan ever is embedded in the slab layer construction of various building interior material, and a shaft seal on both sides of the support members to be one body, the rod axis nahom is formed characterized in that the front end outer diameter is as appropriate and a perforated hole in the deck plate and the rear end outer diameter is larger and configured to be fixed without shaking by the extension in apsap by having a plurality of pawls (acid) and locking groove (valley) in a variety of shapes and shape do.