Did a test run with only the smallest 2X4 hole saw, it has a carbide tooth! didn't look like it could work, worked great, cut fast and a wide piece of wood and left enough room for easy core removal which this tool was designed for. I have several other hole saws, bi-metal and a few other types for wood. This is by far the quickest and easiest way to drill a hole and release the core, not for precision drilling in wood but for cutting a fairly clean hole for construction purposes, good thing it