The Connettore CentroStorico Calcestruzzo concrete screw is an anchor made of carbon steel. The anchor is made in sizes 7.5, 10.5. 12.5 and 16.5, and is screwed into a predrilled cylindrical drill hole. The special thread of the anchor cuts an internal thread into the member while setting. The anchorage is characterised by mechanical interlock in the special thread.