5/16" Armeg PTC Carbide Porcelain Drill Bit

It works, but it's not what I would call fast. I bought this bit after realizing the $19 "glass and tile" bit from the local hardware store wasn't going to work at all. Used it in my variable speed Makita cordless to drill mounting holes for a towel shelf and curved shower curtain rod -- 8 holes total -- in 3/8" porcelain tile Two of us working together could drill one hole in about 30 minutes. I held the drill applying as much pressure as I could. My partner sprayed water into the hole from a water bottle continuously. We worked in 3-minute intervals with short breaks to shake it out between intervals. The first hole took 22 minutes of actual drilling time (not counting breaks). The second: just about the same -- 22 minutes. At this point we decided to take care of other business and come back after lunch for hole #3 and leave #4 for after dinner. #3 took 23 minutes. #4: 28. I can't tell if the bit is getting dull or I'm getting weaker.I used the slower range on my drill with the trigger depressed all the way. I did *not* use hammer mode in accordance with instructions that came with the bit. Shelf looks great. Tomorrow, the curtain rod...

This guy worked great for porcelain! So after trying a diamond bit, I was left frustrated and wondering if I am going to be able to drill 12 holes to install 2 grab bars in a shower. Luckily I came across this gem. Here are my impressions:First, it was very easy to start the hole exactly where I wanted, even when I didn't use a punch to mark the spot, no wandering! Second, I was worried about keeping the bit cool (and sharp!) as I had 12 holes to drill in pretty thick porcelain tiles and I needed this bit to last. So I stopped by the hardware store and bought a 1 gallon garden sprayer for 10 bucks, filled it with ice water, pumped it up and sprayed the drill bit the entire time I was drilling my holes. I set my 18V drill to low speed and the hammer-drill setting and applied steady pressure. This bit drilled like a champ. It did all 12 holes in about 45 minutes time along with mounting the anchors and installing the 2 safety bars. I did notice it was a little slower/needed more pressure towards the last hole or 2, but I am guessing I can get 40 holes out of this bit with the method I described.

Wish I found this drill bit when I first needed to drill holes in ceramic tiles. This drill bit is pricey but very effective. Much better than the three other drill bits I tried first. It started the hole where I wanted it and didn't dance all over the tile. It was quicker. All around a great product worth the price!

This is a real high quality construction grade drill bit that really works in porcelain tile.I ran it kind of dry with just a few squirts of water every once in a while to cool it off. I found that with too much water it did not drill well at all. Seemed to run best when it was kind of scratching it's way thru the tile.Much faster than any other bit I tried to use! I wish that I'd have found it first before trying and wasting my time with other inferior bits including diamond core bits.

Worked great to drill holes in hard ceramic tile. Bit didn't wander getting started either. Used regular water spray bottle in my left hand to cool the bit while drilling with my right. Had to push down to get bit to cut in, but once it got so far in the bit took off and sliced through like it was butter. Drilled eight nice clean holes. Very happy with this bit!

Best I have found also. Waiting until "dust" came from the hole and then sprayed water to cool the bit down. Never thought ten minutes a hole would be considered fast - but now I do!

This is an industrial quality bit. Not available at home improvement centers. Follow the included instuctions as drill speed, and technique are critical to drilling a hole quickly without damaging the tool. Drills a nice clean hole in grade 5 porcelain tile in about 15 seconds. For my project I drilled 10 holes, with plenty of life left in the tool. The instructions claim 20 holes are possible. This bit definitly delivered when 5 others I tried failed miserably. Wish I had found this first. Expensive, but worth it.

This drill bit worked quite well in drilling the first hole. However, the tip broke off in hole #2. Luckily we were able to dislodge the tip from the hole. It was a very expensive, especially when considering only one hole was drilled. You have to continuously aim water at the work site, which causes the floor to become flooded. We found a 5/16" whole saw that drilled the porcelain tile nicely.