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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
190
Review
 3.9 out of 5
190 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.
190 Customer Reviews

Tile drill bit

Would Not Recommend

went through porcelain tile like butter.

June 22, 2026
From 1-3_SLASH_8-in Wet_SLASH_Dry Diamond Core Drill Bit for Stone Verified Purchaser
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Drill bit

Would Recommend

Great drill bit

June 20, 2026
Verified Purchaser
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Does require a steady hand

Would Recommend

Easy to start hole even without guide bit

June 12, 2026
From 1-in Wet_SLASH_Dry Diamond Core Drill Bit for Stone Verified Purchaser
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Drill that Tile!

Would Recommend

Had to drill some tile that was part of our backsplash to mount our new above the oven range microwave and there was no existing mount from the previous one! Made quick business of it! Nice and easy!

May 26, 2026
Verified Purchaser
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Perfect

Would Recommend

Exactly what I needed to make my countertop water filter system!

April 23, 2026
From 1-in Wet_SLASH_Dry Diamond Core Drill Bit for Stone Verified Purchaser
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Great service & Great recommendation

Would Not Recommend

This drill bit worked as the Lowes' associate told me. Worked great on drilling 4 different items.

April 16, 2026
From 1_SLASH_4-in Wet_SLASH_Dry Diamond Core Drill Bit for Stone Verified Purchaser
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Response from Team Kobalt

Thank you so much for the 5-star review! If you ever have any questions or need anything, we’re always here to help! Read More

Team KobaltApril 16, 2026

Kobalt-Lowes

Useful for many materials.

Would Recommend

Very durable for price point.

April 16, 2026
From 1_SLASH_4-in Wet_SLASH_Dry Diamond Core Drill Bit for Stone Verified Purchaser
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Response from Team Kobalt

Thank you for your review! We're glad to hear you found the bit durable and a great value. We appreciate your feedback and thank you for choosing...

Team KobaltApril 16, 2026

Kobalt-Lowes

Diamond Core Drill for Bathroom Remodel

Would Recommend

Used it to help me put tile in my new bathroom. This tool is really helpful and seems to be of good quality. I'm working on the bathroom all on my own and my wife picked out the most difficult tiles she could find, of course. But this little thing has been holding on great.

April 10, 2026
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

Thank you for the 5-star review! We're glad to hear the core drill bit has been holding up well and helping you get through your bathroom project...

Team KobaltApril 16, 2026

Kobalt-Lowes

Diamond Drill for Bathroom Install

Would Recommend

Used it to help me put tile in my new bathroom. This tool is really helpful and seems to be of good quality - as i haven't destroyed it so far.

April 10, 2026
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

Thank you for the 5-star review! We're glad to hear the drill bit has been helpful on your bathroom tile project and is holding up well so far. W...

Team KobaltApril 16, 2026

Kobalt-Lowes

What I needed for the job

Worked out great

April 5, 2026
Verified Purchaser
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Try to evacuate material every quarter inch….

Would Recommend

Worked well. Takes a little practice starting the drill bit to accurately hit your mark since it doesn’t have a pointed tip. Since it’s more like s hole saw, it can sometimes be a pain trying to evacuate the material that gets lodged inside.

April 1, 2026
From 1_SLASH_4-in Wet_SLASH_Dry Diamond Core Drill Bit for Stone Verified Purchaser
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Porcelain

Would Recommend

Easy to bit to use on tile. Cut through my porcelain tile well without cracking tile. It did take some time and steady pressure.

March 25, 2026
Verified Purchaser
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Cut Clean Through Glass

Would Recommend

I bought this to cut a hole in my glass table so I could mount it to a frame I had built. It worked very nicely and made a clean, smooth cut without cracking the glass. Took my time and it did exactly what I needed. I would definitely buy this again if needed.

February 22, 2026
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