1. Safety arm him Perfected which are formed by mechanical faces union of several bodies or which have been previously machined to allow its engagement and subsequent consolidation of said body or faces by locking elements such as bolts or similar screws for assembly said case characterized in that the housing (10) comprises a base (13) to the perimeter (20) are supporting contact faces (11-12) by the aid of two separate magnets (15-16) incorporated in the vicinity the edges (19-20) of said faces (11 to 12). 2. Box according to perfected arm him claim 1 characterized in that the magnets (15) in one of the possible embodiments are embedded on the surface (17) of the large base of one side (12). 3. buildable improved box according to claim 1 characterized in that the magnets (16) in one of the possible embodiments are embedded on the surface of the small bases (18) of the faces (12). 4. buildable improved box according to claim 1 characterized in that the boxes (10) can be joined by their faces (11 to 12).
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