This is an awesome part for simplifying your stir plate build. I ordered it after the fan on one of my stir plates broke. I'd originally used rare earth magnets positioned on a metal washer that was then glued to the fan. It worked fairly well but the washer and magnets weren't perfectly centered, resulting in a bit of a vibration at higher RPMs. The Magnet Mounting Thingy is much easier to align so there's no vibration and it holds the magnets securely.