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5/16-in Wet/Dry Diamond Core Drill Bit for Stone

Ratings & Reviews for Kobalt 5/16-in Wet/Dry Diamond Core Drill Bit for Stone

3.9
196
Review
 3.9 out of 5
196 Reviews


69% Recommend this product

Ratings may include incentivized customer reviews.

What Customers Are Saying

The diamond-tipped ceramic drill bit generally performs well for drilling holes in ceramic, porcelain, and glass materials, though it requires some technique to use effectively. Many found starting the hole at an angle and using water to keep the bit cool helped produce clean, chip-free holes. However, some reported issues with the bit wandering, wearing down quickly, or struggling with thicker or harder materials. The bit seems to work best for lighter-duty applications when used with care, but may not be suitable for more demanding tasks. Proper technique and patience are key to getting good results.

Customer review summary generated by AI, including incentivized reviews.
196 Customer Reviews

Drilling porcelain tile

Would Recommend

This drill bit worked well, I had to drill 9 holes to install my shower door. It drilled perfectly, The key way to do it is start at a 45 degree angle so the drill bit won’t walk around.once it starts you slowly move it to a straight angle.keep the drill wet and clean it out after every hole and you should have no problems.

October 7, 2023
From 1_SLASH_4-in Wet_SLASH_Dry Diamond Core Drill Bit for Stone Verified Purchaser
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No very good quality

Didn't do the job afterone use

October 5, 2023
From 1-1_SLASH_4-in Wet_SLASH_Dry Diamond Core Drill Bit for Stone Verified Purchaser
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Response from Team Kobalt

Dear Lowe’s Customer, We would love to know some details on the size of material you were working with and tool you were using, so that we can better...

Team KobaltJanuary 22, 2024

Kobalt-Lowes

Ok

Would Not Recommend

Hard to get stone out of. No pilot drill. But it worked

September 30, 2023
From 2-1_SLASH_2-in Wet_SLASH_Dry Diamond Core Drill Bit for Stone Verified Purchaser
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Didn’t last.

Would Not Recommend

The bit couldn’t handle the heat and got completely bent/twisted after just a few holes even though I was using water to cool occasionally.

August 26, 2023
From 1_SLASH_4-in Wet_SLASH_Dry Diamond Core Drill Bit for Stone Verified Purchaser
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Response from Team Kobalt

Dear Lowe’s Customer,
We would love to know some details on the size of material you were working with and tool you were using, so that we can b...

Team KobaltSeptember 12, 2023

Kobalt-Lowes

No pilot bit make the product hard to control

Needs a pilot bit

August 12, 2023
From 2-1_SLASH_2-in Wet_SLASH_Dry Diamond Core Drill Bit for Stone Verified Purchaser
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Response from Team Kobalt

Dear Lowe’s Customer,
We would love to know some details on the size of material you were working with and tool you were using, so that we can b...

Team KobaltSeptember 12, 2023

Kobalt-Lowes

Done in One (hole)

Would Not Recommend

This bit's hollow shaft bent halfway through 5/16" thick ceramic tile, rendering it useless for a 2nd hole, same as described by a user 1-year ago. Very disappointed, particularly as it was recommended by the department's staff member (who was otherwise helpful).

August 5, 2023
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Response from Team Kobalt

Dear Lowe’s Customer,
We would love to know some details on material you were working with and tool you were using, so that we can better unders...

Team KobaltSeptember 12, 2023

Kobalt-Lowes

Use this bit for porcelain tile

Would Recommend

Worked great, good price

July 7, 2023
From 1_SLASH_4-in Wet_SLASH_Dry Diamond Core Drill Bit for Stone Verified Purchaser
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Beware of Cobalt diamond drill bits.

Would Not Recommend

Product did not hold up At all or as described on the the packaging. Initially I bought two “Just in case”! Well I needed the second one and had to return for a third one! They all failed, two which broke off in the hole clogging the hole I needed to install an anchor bolt. I had holes to bore and had to finish them off with masonry bit using brawn in lieu of a sharp bit.

June 26, 2023
Verified Purchaser
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Response from Team Kobalt

Dear LOWE’S Customer,
We would love to know some details you experienced to evaluate the rating you provided. Please give us a call at 833-514-...

Team KobaltSeptember 12, 2023

Kobalt-Lowes

Logan is great

Would Recommend

Logan is always right on time and has a great smile.

May 2, 2023
Verified Purchaser
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drill press maybe?

Would Not Recommend

without a "starter" pilot hole, this will not work. Might work with a drill press, but not with a hand drill

March 19, 2023
From 1-3_SLASH_8-in Wet_SLASH_Dry Diamond Core Drill Bit for Stone Verified Purchaser
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Response from Team Kobalt

Dear Fred,
We are sorry to hear that you had trouble with your hole saw. We would like to discuss the situation you had and assist you with a so...

Team KobaltMarch 30, 2023

Kobalt-Lowes

No Issues at all! KNOW what your doing!

Would Recommend

I have drilled 6 holes in porcelain with this bit so far and it looks the same as it did out of the package. The bad comments are from people who have no idea of the concept of drilling in concrete and tile...sorry not sorry! Put your battery screwgun on LOW speed and have a squirt bottle of water ready...the bit must remain COOL during drilling, and that's what the water is for. As soon as you break the surface of the tile by drilling on a slight angle, have someone squirt water on the bit th...

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Awesome at drilling throug ceramic tile already up

Would Recommend

Great product! Drilled hole in tile as described.

February 28, 2023
Verified Purchaser
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Worked great

Would Recommend

I think the negative reviews are from people who didn’t know what they were doing because this worked perfectly on porcelain tile. Start at high speed at 45 degree angle and gradually move to straight on. Spray consistently with water while drilling and clean out the hollow bit too. Drilled 8 holes and could have continued drilling with no problem

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Response from Team Kobalt

Thank you for your review Laurel, also for being so helpful on the instructions of use. We are glad you had a great experience with our hole saw. ...

Team KobaltMarch 30, 2023

Kobalt-Lowes