Review on 📦 GRK Caliburn XL HandyPak Package CAL1964312HPXL by Luca Washington

I find that these screws break if the holes are not drilled deep enough, or for some reason there is a lot of dirt in the concrete when the screws are inserted. Usually the head will loosen if the hole fills up (or doesn't get deep enough. Also, the metal of the screw is brittle, don't bend it (offset of the holes between the concrete and the fastened material) or it will break. But with the due care, the screws work.