Abstract: This stretching means comprises a main body (1) which comprises a connection opening (2) and a rotating mounting opening (3); in the latter there is a rotating part (6) endowed with a command head (11) which forms a winding reel (7) for the wire to be stretched; on the main body (1) there is a slide mobile cramp (12). The winding to stretch the element is done by turning the command head (11). Once the suitable stretching has been achieved, the slide mobile cramp (12) is slided until said command head (11) is introduced into the cramp recess (15) formed by the cramp fork (14). Under these conditions, the rotating part (6) is fixed, keeping the tension.