Milwaukee 49-56-0505 1/4" Hex Shank Diamond Abrasive One-Piece Hole Saw Power Drill Bit

The best way to drill porcelain tiles or granite without chipping or cracking.

Works great!

It's absolutely critical that you keep this bit cool I did this by continuously spraying the bit with a spray bottle of water and keeping the hole and the center of the bit clear of the porcelain dust To clean the center of a bit use wire or another drill bitI pulled the bit out maybe 10 or 15 times your hole to clean both the hole and the bitI went with a relatively slow speed - so slow that I could see the revolutions of the bit I stop frequently to clean up a whole and the bit itself. And to check temperature of the bit - if it's even warm you're going to fast not keeping it clean enough and not using enough waterOnce the bit gets too hot The diamond will flake off instantly Of course I learned this the hard way :-) my first attempt I got one and a quarter holes out of my first bit simply by not using water going too hard and too fast I'm not a materials engineer but my guess is they use a resin to hold the diamond flakes to the tip shaft of the bit and then if you let too much heat buildup it dissolves or melts the resin and the Diamond flakes flake offBut keeping the bit cold prevents thisI have gotten 12 holes through thick porcelain large format tile and I'm still on the same bit and I can still feel the grit - I plan on 10 minutes a hole Starting your hole is not difficult at all again if you know the technique Just as they say on the directions start at an angle use very light pressure that just starts to scratch the tile at the bottom of where you want your whole After you're in for a 32nd of an inch or so you can very slowly start bringing your drill perpendicular to the face of the tile If you apply too much pressure before your whole is started the bit well walk on you but if you go slow and easy with very light pressure don't get too anxious or ahead of yourself it works like a dream Again use water even at the beginning stage The other thing that I found was helpful was using the Milwaukee Hammer drill. I used a variable speed drill for my first eight or 10 holes and then tried my light duty hammer drill my next eight holes went about twice as fast The Milwaukee light duty hammer drill cost me $100 and it's saving me at least five minutes per hole So go slow, use light pressure initially, continuous spraying of water, keep your bit and the hole clean, and use a hammer drill

I did not purchase this bit through Amazon. It however is a really good bit. I kept the bit cool with a water spray bottle and used a rag to wick away the mess as I drilled the hole. I would have given this bit five stars but the bore hole would get clogged with porcelain and I would have to remove the bit and clear it out with a slightly bent finishing nail.

Not a verified purchase item; I did not buy this through Amazon as it's the sort of thing you need NOW if you want to go home in time for supper. BUT, this is good enough to have the by-line: "don't buy anything else". It's good. It's a hole saw you can use as a drill bit (carefully!) to get through that hard hard porcelain tile. Follow Jeff Curl's review. Follow it to the letter, and you will like this. It may save your bacon.

I took a chance on this bit to drill holes in my bathroom tile. I was mounting a grab bar in the shower. I drilled the first 2 holes with a normal diamond tip. The bit failed while starting the third hole. The Milwaukee mini hole saw was twice the price of the other (name brand) diamond tip of the same size. This bit drilled the remaining 4 holes in 1/2 the time of the first 2, with less heat generated and effort required. It cut best at about 500 rpm. The final results were clean, uniform holes. The best part was starting the cut. The bit requires very little effort to prevent traveling when starting the cut, as long as I followed the instructions to start the cut at 45 degrees to the surface to get a bite and then level out. Easy. This will be my first choice next time I cut into stone or tile.

using this bit, water and not a lot of pressure, I was able to drill 3 holes in porcelain tiles under 30 minutes, including set up, clean up and coffee break :-).For comparison, it took me 30+ minutes to drill one hole carbide drill from the German manufacturer. YMMV.Just start at an angle to get it going, use plenty of water to keep it from overheating and enjoy the ride.

Worked flawlessly, I drilled six holes with it and all drilled perfectly, no cracking or chipping of the tile!

Keep it wet and it will do so many holes … proper kit

Non avevo mai usato una fresetta diamantata, perciò credo di poter dare un giudizio neutrale sul prodotto.In bagno ho delle piastrelle in gres spesse e dure😞.Per fare i primi 3 fori ho acquistato una punta multifunzione di produzione tedesca, su consiglio dell'idraulico..... tempi di foratura per un foro...45 minuti!Così, dovendo montare tutti gli accessori, mi sono decisa ad acquistare questa. Tempi di foratura per un foro...10-15 min. Pur essendo una principiante, mi sento di dare qualche consiglio:1) io ho preimpostato l'entrata della fresetta con una punta multiuso dello stesso diametro di quella della fresa; questo perché inclinata a 45° non riuscivo a tenerla ferma!2) ho sempre tenuto la punta bagnata, con uno spruzzino e nelle pause, lasciandola riposare in una tazzina con un po' d'acqua.3) quando la canula interna si riempiva di materiale, cioè del residuo solidificato del materiale asportato, la svuotavo aiutandomi con una piccola brugola.....il materiale che ne esce è praticamente pietra.Ho eseguito ben 12 fori e la punta è ancora perfettamente funzionante....fortuna però che a me non serve più, perché è stata una faticaccia.Ancora una nota: sebbene venga consigliato di usare un avvitatore (il mio è un Milwaukee 12v), col trapano lavora molto meglio.... comunque sempre a bassi giri e SENZA percussioni.

Rien à dire.

La mejor broca porcelanica que probe hasta ahora

2fix Plumbing