This hole saw set is perfect for my tile project. You line up the hole saw in the bearing mount, then slowly drill through the tile. I used a plastic container to place the tiles in half an inch of water to cool. Worked great. The other tile was too big to fit in the trash can, so I used a small 1/8" pipe and sucked the water out of the bucket and just let it pour over the area I was using for cooling and dust control drilled. This method also worked well. Several hole saw shanks were slightly out of round, causing the drill to wobble slightly. In this case, simply use a slow drill speed. The set is not "professional" quality, but more than adequate for do-it-yourselfers. I was satisfied with the product and the result.