On the back surface 3 of the base 1 has four L-shaped in cross section, the guide beams 5, each of which is adjacent to the base 1 with one of its ends and facing its inner edge 6 towards the periphery of the base 1, two or more elastic disposed interval shifted to the periphery of the base 1 that compensate for projection 4, and at least one open side periphery of the base, dismantling recess 7. at least two of T-shaped beams 5 are formed with indented from their shelves the peripheral edges of Ba Bani 1, at least one of L-shaped beams 5, formed with the approach of one of its flanges to the peripheral edge of the base 1. The utility model can be easily installed in the support hole and is easily removed from the hole carrier, including from blind slot, has a low consumption of materials, provides quality unambiguous positioning relative to the opening wall may be made of materials with a relatively low elasticity.
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