It's very good. Whole and without flaws.

This product is the tool required if you need to guide a diamond hole bit to drill an accurate hole into a solid stone or tile countertop for a faucet or any other reason for that matter. Great concept and it works well at a good price. How can you go wrong?

This is an awesome invention. If you need to cut nice perfect round holes in tile, especially porcelain, this is the template to use. It worked beyond what I expected.

Cheap and very effective to avoid the blade hopping around. I only had maybe two or three holes to drill for vanity but I didn’t want to risk it. Very happy with the end result.

This is the perfect tool for drilling into acid-resistant countertops. I had to enlarge a faucet hole and it worked great. It was my first time ever drilling into this type of countertop and it worked perfectly. One will not go wrong with this tool in the toolbox. Highly recommend this one you will not go wrong!

Read how others used this and you'll be glad you bought this. I used plumbers putty to keep in water and diamond tip hole saw and went slow on marble and I cut a 3-inch hole that the greatest tile cutter in the world would envy.

This tool is great. Wish I would have had it years ago. Absolutely essential for making clean accurate holes in ceramic or marble tile. Diamond drill bits do not have a centering bit to guide the initial hole start. The bits will skate along the surface causing damage. This tool eliminates all the alignment issues associated with drilling in ceramic or marble

This part worked great, I used some duct tape under it to make sure it didn’t get squirmy when I first started, held in place great for my cut through granite to install a soap pipe.

I ordered and used this to enlarge a countertop hole for a kitchen faucet. I had been worried about centering the hole given the existing hole being in place. The suction on this guide kept it in place and it worked perfectly. As a result, I avoided having to pay a $150 countertop service call. Well worth the price.

This works wonderfully for drilling holes in glass. The bearings seem to be sealed so when I use water to cool the drill bit the glass power does not seem to bother them.