Review on Diamond-Guided Porcelain Bathroom Suite by Dustin Keller

I brought this "cheap set" to drill a hole in porcelain stoneware. It easily cuts a clean hole and the guide tool does a great job of preventing the drill bit from sagging. I've used the bits a few times and they work perfectly. They look cheap, the price is cheap, but they work great! I drilled a series of holes with the larger bit and cleared out the centers with the smaller bit to make a 4" hole in porcelain stoneware and it was clean and easy. made quite a while ago. Keep bits wet while drilling.