This tool works very well to fill loose or broken knots in wood or to repair damaged spots. You can also make your own side-grain plugs, perfectly matched, from the wood of your choice.
Important: To use the plug cutter, one needs to use a drill press and to clamp the wood firmly, as there is no pilot bit to guide the cutter. The counter sink can be used free hand. But, for instance when you must drill near a very small or loose knot, or in splintered wood, where the drill bit might wander, it is better to use a drill press, like with the plug cutter.
These sets are good for people who are not looking to make large quantities of plugs or pegs, but who would find it useful to cut a few from time to time. Made in Japan.