Here is a review left by a customer on a product. Would you say he was satisfied or dissatisfied?
Title: Okay for wood, not fiberglass.
Review: These are not tool grade! Not very sharp, not precision machined. You can use it for wood in electric drills, but I would not try counter-sinking in fiberglass. As you know, fiberglass holes should be counter sunk to prevent radial cracking. These sinks are not sharp, nor precision enough to be used for this task.
