Not quite a precision hole cutter. Works really well in drywall and great for cutting holes for speakers etc. I had to cut 88 holes in 3/4" plywood. Getting the blades to the exact size was a bit tricky, but with a little effort it is doable. My allowable tolerance is about 1/16" for 1 1/4" to 4" diameter holes. It did the job and still does. Again, for the money this is a good value .