1. improved building strut, which including a lower tube, inside which telescopically engages a top tube with a row of holes for height adjustment using a pin which is inserted into one of these diametrical holes and a nut with coupled at an upper position of the lower tube, and including the free ends of both tubes support plates, handles is characterized in that it incorporates a stop member which distance plate (3) of the upper tube (1) with respect to the nut (8 ) threaded on the lower tube (2) in the retracted position of the strut; all in order to prevent the user's fingers are caught when the top tube (1) falls down by gravity after removing the pin (6).
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