Using this product, our team found that the Hillman Fastener concrete screws are a perfect addition to our industrial and scientific toolkit. These screws are incredibly easy to use and never REQUIRE any additional anchors or drill bits. The self-tapping design makes for a remarkably strong hold effectively securing our projects to any concrete surface. The only downside is that these screws are not suitable for softer materials such as drywall or wood. Overall, we highly recommend these screws for all your concrete needs. .