The present invention relates to a pressure-applying telescopic spacer formed by two attached tubes telescopically coupled to one another with sheet metal rings pushed by a spring for establishing a wedging and driving of the sheet metal rings on the inner tube and blocking the axial movement of the latter with respect to the outer tube. The assembly of sheet metal rings and push spring being located in a head belonging to a sleeve with anchoring devices for the fixing thereof on the outer tube. The body determined by the sleeve and the head or expansion forming a handle for manually handling the spacer. Support plates are connected with movable devices for adjusting the spacing length of the spacer itself to the desired measurement are included at the ends.