These vertical threaded concrete screws are a fantastic addition to any toolbox. As an industrial and scientific professional, I have put these screws to the test multiple times and they never disappoint .They grip concrete exceptionally well and provide a secure hold. The construction of the screw is top-notch and ensures longevity. While they are a bit pricier compared to other screws, the quality more than makes up for it. These are a must-have for any concrete project..