Opening with practicable, perfected closing plate, essentially characterized in that its interior frame, single piece and split by one of its longitudinal sections, has an l section whose peripheral section comprises inner rim, an outer peripheral peripheral groove with inner rib, and another outer periphery groove coinciding with the inner plane of the other section of the l, whose grooves constitute weakening lines of the frame to proceed to the peripheral breakage thereof by them and thus be able to adapt the set to different wall thicknesses whose frame is fixed to another one-piece outer frame carrying the closing plate, which is articulated to a longitudinal section thereof by means of self-swiveling hinges constituted by transversely inflected insert plates and which, by one of its ends, engages by lateral flange in respective slits of the face inside of the outer frame, while at its other end it is the inserts are attached to the closing plate by means of two buttons with a drilled spigot in which a stop in an arched extension is secured by means of a pin. (Machine-translation by Google Translate, not legally binding)
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