Through trial and error, I found that these industrial drill bits are not worth the investment. Despite being advertised as diamond grinding bits, they barely make a difference when trying to grind through harder materials. The only pro is that they do fit into the drill chuck without any issues. However, the cons outweigh this as they are not as durable as other high-quality bits I've used. As someone who works in the Industrial and Scientific sector, I highly recommend avoiding these bits and