Lenox DG HOLESAW 3DG 3/16 5 MM 1/PK

I was nervous to cut through the porcelain tile backsplash in my kitchen to install a microwave bracket, since I'd never done anything like that, but this drill bit was able to drill two holes for the stud screws cleanly. I did have some challenges with the bit walking as I was starting a new hole, but I could have probably prevented that by applying more layers of tape to act as a guard. This isn't a fast process, btw. Expect to take a couple of minutes for each hole, using moderate pressure and speed, while stopping often to dip the drill bit in water.

I am installing a railing along my front porch and had to drill approximately 36 holes through the porcelain tile. Because of the positioning, I had to drill a few holes with the improper technique, which burned them up in only a couple holes. When I used them the proper way, they lasted for at least 12-15 holes. The packaging has pictures to show the proper technique but it is not obvious. Here is the best way, which is consistent with the instructions. 1. drill a 9/32 hole through a piece of 1/2 -3/4 piece of wood. Make sure the piece is long enough to stand on or lean on while you are drilling. Drill the hole close enough to the edge so you can still use it as a guide when you drill close to a wall. 2. line the guide over the marked hole location. 3, drill just deep enough to create a circular ring in the tile. 4. remove the guide and begin to drill FULL SPEED and apply as much pressure as you can as you flood the cutter and hole with water using a squirt bottle. This will flow the debris out of the hole and keep the bit cool. The heat will not affect the diamond, but it will overheat the adhesive that is holding the diamond dust to the steel bit and cause it to release. 5. After each hole, use a finish nail to clear the tile plug from inside of the bit. If you don't do this regularly, the plug will eventually build up and jam into the inside of the bit. Then, instead of penetratingly into the tile, it will just spin in place and heat up. 6. repeat.

I needed to drill a few 1/4"(ish) holes in quartzite, 3 cm thick, thicker than most. First off, note that the holes produced are a bit bigger than 1/4", indeed the bit is wider than 1/4". But no matter in my case. I have drilled ceramic tile and glass previously, but no experience with something as hard as quartzite. It is a HUGE difference! Starting the holes was easy and more accurate than I had feared, and the first hole drilled pretty easily, maybe 3-4 minutes of "on time", with breaks to spraying water into the hole to remove dust and to rest. The second hole was a different matter, it took perhaps 12 minutes of "on time" to get through and required an enormous increase in force. I would not waste my time attempting a 3rd hole with this bit. At no time did the bit get really hot, in fact it was always touchable when withdrawn from the hole--warm to be sure, but not really hot, not able to flash water sprayed on it. So plan for one bit per 2 holes, or one per hole if you want it to be easy in 3cm quartzite (6 cm total, so perhaps 3 holes in ordinary 2 cm thick quartzite). Pretty disappointing at this price point. I note that the package does not mention quartzite--granite is much softer, so perhaps the tool is just not up to this application. Then what? I probably should have asked the stone fabricator. BTW, the pictogram instructions for use on the package are nearly useless in any language. Remarkably, made in the UK, packaged in Taiwan!?

This drill bit works better than other types of drill bits on porcelain. Most of the other 5* reviews are accurate. I used the bit to make 12 holes in porcelain tiles in a shower to install grab bars. It takes less than one minute to drill each hole. Be careful to start drilling at an angle to start the cut than slowly rotate your drill to a perpendicular position so that the bit doesn't slip across the face of the tile. Be diligent to clean the bit between each hole and check during each hole drilling session to clean out porcelain debris which will pack the channel inside the bit. The bit will get hot so spray with water or intermittently stop drilling and dunk the bit in water. The bit looked brand new after 12 holes. This bit definitely works well for the price.

I bought this hole saw to drill a hole for water filter system faucet. It made a nice 1/2" hole and still looks new. One important thing to remember is, don't force it hard and don't overheat it, use a bit of water when drilling.

Excellent product. I installed 7 grab bars into porcelain tile with Wingits. I first attempted to use the Wingits Apache 200 drill bits designed for use with Wingits. The porcelain destroyed the bits. I suspect the bits would be fine in ceramic tile, but not for porcelain. I cut all the remaining holes (4 per grab bar) with the Lenox Diamond Grit Hole Saw without incident. As a matter of fact, after my bad experience with the Wingits Apache 200 bits, I was afraid I would get partially finished and have to order another bit, so I ordered 2 right off the bat. Turns out that I only used one and it is still good! If you have never used one of these hole saws, watch a you tube video first. If you do it properly, keeping the bit cool, you should be able to use the saw for many holes.

I bought this to make a 1-1/2" hole in a granite countertop in order to install a hot water dispenser. It's well made, which typical of Lennox hole saws, and the barrel is long enough to be used on a countertop. It worked its way through a thick slab of granite cleanly. You have to keep it cool to avoid damaging the bond that locks the diamond abrasive to the metal barrel of the hole saw. The easiest way to do that is to make a 2-1/2 or 3" circle of plumber's putty about 3/8" or 1/2" deep and fill it with water. Then start the cut, angling the hole saw to about 45 degrees so that it gets started cutting an arc. The tip the drill slowly to 90 degrees to finish the cut. Search on YouTube for "granite countertop hole" on YouTube for good videos on how to do it.Use a cordless drill with a good battery and be patient. It takes maybe 5 or even 10 minutes depending on the thickness of the stone. Keep water in the circle of putty and remember that as you cut through the stone, when the saw begins to penetrate all the way through, the water will start to drain out.

Fantastic tool preform perfectly drilling in my quartz countertop using cordless drill on low speed and dipping in water few times

Durable and long lasting. Relatively easy to use on ceramic but so slow on porcelain as expected. Keeping it wet and cool is a must.

Great quality tool, as expected from a brand of Lennox’s reputation. Will definitely be ordering more in future.