As someone who works in the industrial and scientific field I'm always on the lookout for high-quality cutting tools .After trying out this adjustable countersink, I have to say I'm impressed. The precision is fantastic, and it's durable enough to handle heavy use over the long-term. The only downside is that it takes a bit of practice to get the hang of at first, but once you do, it's smooth sailing. Overall, Id highly recommend this product to anyone in need of a top-notch countersink..