Undoubtedly, these are the best countersinks for Wood, Finishing. DO NOT ATTEMPT TO USE THIS ON METALS. I find that more aggressive looking countersinks are better suited for use with metal. So far I've used one size for my purposes, but there are three more in the kit that you may need. They are small and large enough for small to medium sized applications. The sinks come out clean and round with no dirt or burrs when used with a power drill. Using a hand drill will give you the same result, but the sink may appear oval due to the angle you are drilling at. After a few weeks of working the drill all day, the one drill bit I used is still sharp. Take your time with them and it will last longer. Most importantly, they sink. Tip: Drill a pilot hole first, this will help you dive easier and more accurate/straighter. For the price they are worth the investment.