Wherever it is not possible to perform the riveting of plain rivets due to the inability to deform the base of their shank, such as inside of empty and closed bodies (tubular) or full bodies easily deformable (wood, rubber, thermoplastics, building materials, etc.). the expansion rivets with inserted pin are useful, simple and quick to use.\r\nAs the illustration shows, the grooved pin inserted in the hollow rivet causes the expand of its bottom properly cut, so that the parts to be riveted remain firmly united.