As a DIY enthusiast, i have used many industrial and scientific cutting tools. According to my experience this particular one is a complete waste of money .Despite the manufacturers claims of extra high speed, the drill bit barely cut through the material. The pros? I didn't injure myself while trying to use it. The cons? The drill bit broke after only a few uses, rendering it useless. Don't make the mistake of buying this product, save your money for a better quality tool..