Review on Diamond Countertop Porcelain Bathroom Installation Cutting Tools in Hole Saws & Accessories by Kantrel Tunstill

For the price this is a great tool for a small job. Don't buy this expecting to use it again and again, it's just not going to happen. But if you only need a few holes or just one, this is for you. I bought two and used one to practice on a piece of glass. It took me about 15 minutes to poke a hole in my 20 gallon tank, but I took my time. After the 3rd hole the bit got really slow and I'm not sure I would use it again if I didn't have to.