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1/4-in Wet/Dry Diamond Core Drill Bit for Stone

Ratings & Reviews for Kobalt 1/4-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

This diamond-coated drill bit performs well for drilling clean holes through ceramic, glass, and tile materials, especially when used with water to keep the bit cool. However, it can be challenging to start the hole and keep the bit steady, particularly on porcelain tiles. Users recommend starting the hole at an angle, gradually straightening the bit as it cuts, and using a low drill speed. The bit may wear down quickly, especially on thicker or harder materials, so it's best suited for light to moderate use.

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

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.

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Works great on granite!

Would Recommend
December 8, 2025
Verified Purchaser
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Response from Team Kobalt

Thanks for the 5-star rating! We appreciate your feedback! Kobalt-...</p><button class=Read More

Team KobaltJanuary 29, 2026

Kobalt-Lowes

Cut great

Would Recommend

It cut through my granit counter top easily.

October 17, 2025
From 1-in Wet_SLASH_Dry Diamond Core Drill Bit for Stone Verified Purchaser
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Response from Team Kobalt

Thank you for the wonderful 5-star review! We're so glad to know our products are meeting your expectations. Your feedback encourages us to keep ...

Team KobaltDecember 4, 2025

Kobalt-Lowes

One more bit for the box.

Would Recommend

Chewed right through the TileMaster brand porcelain that Lowes carries. Several holes and it is still holding up fine. Keep the RPMs low. I keep a cup of water on hand to wet the cut. Again, keep the RPMs low. Helps to keep the cut nice and cool. If cutting thin material it actually helps to have a wimpy drill on hand. As other have stated, there is no pilot for this bit. But there is an easy fix. Jigs are the carpenter's best friend. Find a piece of thin wood, 1x4 or similar. Type is not re...

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Response from Team Kobalt

Thank you for the great 5-star review and for sharing your experience. We’re glad to hear the bit performed well on porcelain and held up across mult...

Team KobaltJanuary 29, 2026

Kobalt-Lowes

Not an aggressive bit

Would Not Recommend

Does not cut well compared to other brands at this size

August 26, 2025
Verified Purchaser
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Response from Team Kobalt

Thank you for your feedback. We’re sorry to hear the bit didn’t perform as aggressively as you expected. Our 1/4-in Wet/Dry Diamond Core Bit is desig...

Team KobaltOctober 9, 2025

Kobalt-Lowes

drill bit

works just fine, drills hole in ceramic

July 30, 2025
Verified Purchaser
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works

Would Recommend

works

July 19, 2025
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

Thanks for the 5-star rating! We appreciate your feedback! Kobalt-...</p><button class=Read More

Team KobaltJanuary 29, 2026

Kobalt-Lowes

Would Recommend

It works

July 7, 2025
From 5_SLASH_16-in Wet_SLASH_Dry Diamond Core Drill Bit for Stone Verified Purchaser
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Response from Team Kobalt

Thanks for the 5-star rating! We appreciate your feedback! Kobalt-...</p><button class=Read More

Team KobaltJanuary 29, 2026

Kobalt-Lowes

Fit my smaller size drill motor

Would Recommend

Constructed to bore through tile flooring

June 21, 2025
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

Thanks for the 5-star rating! We appreciate your feedback! Kobalt-...</p><button class=Read More

Team KobaltJanuary 29, 2026

Kobalt-Lowes