When I tried this industrial and scientific triangular multifunctional punching concrete drill bit i was beyond pleased .Not only is it durable and efficient, but it can also be used on multiple surfaces. The triangular design allows for added stability and precision when drilling through tough materials such as concrete and metal. However the downside to this product is that it is a bit on the pricey side compared to other cutting tools on the market. Overall, I highly recommend this drill bit for anyone in need of a reliable and versatile tool..