5-Pack 5/16" Diamond Core Drill Bits Set, 8mm Tile Drill bits for Ceramic Porcelain Marble Granite Tile Stone Glass Brick, Integrated Coolant for Fast Dry Drilling, Round Shank, with Storage Case 5 Pcs 5/16“ Diamond Bits

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• P

  Paul Anderson

  Works great, go slow, keep it wet.

  These worked great. Keep the ceramic you’re drilling into wet to prevent heat from building up. Start at an angle. Once you get it going rock back and forth. Don’t apply to much pressure. It’s slow, but it does work. I didn’t break anything. I drilled multiple holes in many planters. Even one in a large coffee cup that I’m using as a planter.Ver másVer menos

  8 personas la encontraron útil

• M

  Ms. Kitty

  Works great

  Great value for the money. Soild steel diamond bits - sharp enough to make a hole maybe 1/4 inches in diameter. Didn’t take a before photo but as shown in the photo the pitcher is quite thick. Took my time, ran a slow stream of water and slowly angled the drill with constant pressure didn’t shatter and I’m very happy with the results.Ver másVer menos

  4 personas la encontraron útil

• A

  Amazon Customer

  9 de julio de 2026

  Works OK

  Not easy to drill through moderately thin ceramic. Following the instruction to begin at 45 degree angle is important. They seem of decent quality and get the job done; perseverance is key.

• E

  E. Stott

  11 de julio de 2026

  They worked

  Needed to finish a project, they don’t last forever, but who would expect it to for drilling granite.

• G

  Gabriel

  14 de julio de 2026

  Working good with slow speed, a little bit weather

  Very good for porcelain 3/8 thicker

• A

  Amazon Customer

  31 de marzo de 2026

  It works on hard porcelain!

  I used this to drill holes in the bottom of porcelain or maybe they were stoneware mugs in order to use them for flower pots. At first it was an arduous task. I checked out some YouTube videos first on “how to” and learned the correct method positioning the tool at 45 degree angle at first to get the hole started then gradually turn the drill perpendicular to the mug to get a nice round hole. You have to let the drill do the work without a lot of pressure. And I used water on the bottom of the mug for lubricant. The first one took 30 minutes but with practice I got it down to about 8 minutes a hole. I had 11 to do. The bits themselves worked great! They didn’t get dull at all and did the job efficiently.Ver másVer menos

  2 personas la encontraron útil

• T

  Tom L.

  9 de enero de 2023

  Two of four bits slightly undersized, but capable and durable; measurements included

  The specs for my reverse osmosis water countertop faucet called for a 12.5 mm (0.492" or ~1/2 inch) hole through my 1-1/4 inch granite countertop. I ordered this set which consists of two 1/4", one 5/16", one 3/8" and one 1/2" bit and a plastic storage case.I wet-drilled my countertop with the 1/2" bit and was surprised that I could not fit the faucet in the hole. I ended up using the 1/2" bit as a reamer of sorts and, with some additional time and effort, managed to widen it enough for the faucet to fit. Thankfully, the bit was durable enough to use in this fashion and, after the unexpected step, looks no worse for wear.Here are measurements taken (using a digital caliper) for all the included bits in case anybody needs them. Measurements are in fractional and decimal inches and in the form of: (As-marked fractional inches, As-marked decimal inches, As-measured decimal inches). All bits are new except for the 1/2" bit since I used it yesterday. As you can see, two bits are slightly undersized but the 1/2" bit was the worst offender and not by much. It's just under 12 mm. WIth bit wobble, the 1/4" bit will achieve that extra hundreth of an inch clearance to give a hole meeting spec.(1/4", 0.25", 0.241")(5/16", 0.3125", 0.315")(3/8", 0.375", 0.394")(1/2", 0.5", 0.470")Finally, these are "dry" diamond bits which means they are loaded with wax in the core. As you're drilling, the wax melts and lubricates the bit. There's at least one review here that claims that they are incapable of drilling thick material because they core is blocked. They even posted a picture. The "blockage" is wax and is easily removed (mechanically or with heat) if you want. In my case, I had a bit of the granite core break off and get stuck to the wax inside the bit and after heating the bit a little, managed to push through the wax and push the core out forcing a small screwdriver in through the back end of the bit.Ver másVer menos

  18 personas la encontraron útil

• S

  Scott

  22 de julio de 2026

  Fantastic cutters

  Fantastic. I used soapy water in a spray bottle to keep the glass cool while i drill. Produces a nice clean cut

• D

  Donald Demrow

  25 de julio de 2025

  Bueno

  Bueno

• L

  Louis B

  11 de marzo de 2023

  Great product, very durable and precise.

  We used the drill bits to drill holes in ceramics, for my succulent collection, with great results: clean holes, no breakage and very fast!

• S

  Sven K.

  30 de noviembre de 2024

  Super Bohrer

  Super Bohrer, funktionieren einwandfrei.Gutes Preis- und Leistungsverhältnis

• A

  Anne Marie P.

  28 de octubre de 2023

  Diamond drill bits

  The kit contains 8 drill of different sizes. I wanted to drill through stones (+/-2 inches). I did as I saw on utube and it works perfectly and doesn't wear down the bits. I put the stone in a small bowl, cover the stone with water and drill. I take out the debris frequently and it works. I did 3 stones with one drill bit and it still works.Ver másVer menos
• S

  Sandro Escalera Valdez

  18 de abril de 2022

  Excelente resistencia

  Los he probado varías veces y trabajan muy bien, no dañan para nada las superficies cerámicas y es una excelente opción en lugar de una broca de concreto.