Relates to external exchange aid with first engaging means can engage the landing member on the article, the present invention is the replacement aid, shear and / or peel strength identified when it engages the article I have a. In addition, combination of the article and the external exchange aid, and method of attaching the article using an external exchange aid concrete are also provided. In addition, the article comprising engagement means structure that is specifically designed and Foreign Exchange aid, has an engaging means structures designed particularly provided.
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