When I tried this product I found it to be an efficient and durable addition to my industrial and scientific toolkit. It made it easy for me to drill pilot holes with precision, and it was easy to adjust for different sizes and angles .The titanium coating adds an extra layer of protection against wear and tear. The only downside is that it may take a bit of practice to get used to the adjustments, but once you do, it's smooth sailing. Overall, i highly recommend this set to anyone in need of reliable and efficient cutting tools..