I recently invested in these industrial and scientific drill bits and they have not disappointed me yet! Through trial and error, I found that these titanium bits are sturdy and long-lasting, perfect for any DIY project or heavy-duty construction work. The sharpness has remained intact after multiple uses and the four-piece set covers a diverse range of drilling needs. The only downside is that they are a bit pricey, but the durability definitely makes up for the cost. Overall, I highlyβ¦