Round bars in composite material with the external surface in quartz and terminal frayed for the realization of riveted joints and hinging in the restoration of masonry or concrete buildings, used in combination with fabrics such as UNITEX or MULTITEX in composite material. They can be used in several diameters and length and are properly part of holes which have been prepared through preliminary works and having excellent mechanic properties which can assure a high result to the element and to the structure which has to be consolidated.