The body is weak, the partitions are thin and bend easily. In the 4th hole I drilled, the drill bit broke. The large mandrel has a short drill. So if you use a 4" hole saw with a larger mandrel and you have 1/8" b4, the hole will start cutting without giving you enough centering. But durable and cuts we) but for thicker wood you need a strong drill because of the high voltage I burned a cheap drill.