Stress-free, structural screw anchor suitable for heavy loads and small HOH and edge distances. For concrete, sand-lime brick and masonry. ETA approved for multiple fixings in both the tension and compression zones of concrete. With internal thread connection M8 and M10 in one internal thread. Ideally suited for the structural fixing of threaded rods for cable ducts, pipes and the like. Much lower chance of installation errors than with traditional hammer-in anchors, and considerably faster to install.