The invention refers to a scratch (1) in cargo decks on ships and in other cargo-bearing decks to reinforce the circumference of the intended hole. According to the invention, said scratch (1) shows a flange (5) with a larger diameter (D) than the hole in question and the scratch through the hole-accessible lot (7) shows at least:a attenuation (8) which permits the extension of the collar (1) from the hole ejecting said lot (7) to the formation of a ring (1) retaining thickness on the side of the cargo deck situated on the opposite side of the said flange (5).The invention also refers to the procedure for achieving said cramps.
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