Ratings & Reviews for Kobalt Diamond Core Drill Bit 2-1/2-in Dry Diamond Core Drill Bit for Stone
Ratings may include incentivized customer reviews.
What Customers Are Saying
Customers praise the drill bit's exceptional performance on ceramic, porcelain, and glass tile, reporting clean, chip-free cuts and efficient drilling. Most users highlight durability and minimal wear after multiple holes, though success depends on proper technique—starting at 45 degrees, using low RPMs, and continuous wetting significantly improves results. Some reviewers experienced bit bending or premature dulling, often attributing failures to improper handling rather than defects. Overall, most consider it highly effective for hard surfaces when used correctly.
Customer review summary generated by AI, including incentivized reviews.Not worth the $
Would Not RecommendStruggles to drill into porcelain tile. Could not finish one hole. A waste of money.
From Diamond Core Drill Bit 1_SLASH_4-in Dry Diamond Core Drill Bit for Stone
Poor Quality
Would Not RecommendThe shank/shaft is so thin it bent soon after I started to use it without applying a lot of pressure. I put it in a bench vise to straighten it out to finish the one and only cut it was able to make. I m a contractor and was very disappointed and should have known better to buy a cheap Kobolt tool. I ended up buying a Starrett bit which was American made and much better quality and stronger to finish the job.
Drilling porcelain tile
Would RecommendThis 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.
From Diamond Core Drill Bit 1_SLASH_4-in Dry Diamond Core Drill Bit for Stone Verified Purchaser
No very good quality
Didn't do the job afterone use
From Diamond Core Drill Bit 1-1_SLASH_4-in Dry Diamond Core Drill Bit for Stone Verified Purchaser
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... Read More
Ok
Would Not RecommendHard to get stone out of. No pilot drill. But it worked
Verified Purchaser
Didn’t last.
Would Not RecommendThe 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.
From Diamond Core Drill Bit 1_SLASH_4-in Dry Diamond Core Drill Bit for Stone Verified Purchaser
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... Read More
No pilot bit make the product hard to control
Needs a pilot bit
Verified Purchaser
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... Read More
Done in One (hole)
Would Not RecommendThis 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).
From Diamond Core Drill Bit 5_SLASH_16-in Dry Diamond Core Drill Bit for Stone
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... Read More
Use this bit for porcelain tile
Would RecommendWorked great, good price
From Diamond Core Drill Bit 1_SLASH_4-in Dry Diamond Core Drill Bit for Stone Verified Purchaser
Beware of Cobalt diamond drill bits.
Would Not RecommendProduct 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.
From Diamond Core Drill Bit 5_SLASH_16-in Dry Diamond Core Drill Bit for Stone Verified Purchaser
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-... Read More
Logan is great
Would RecommendLogan is always right on time and has a great smile.
From Diamond Core Drill Bit 5_SLASH_16-in Dry Diamond Core Drill Bit for Stone Verified Purchaser
drill press maybe?
Would Not Recommendwithout a "starter" pilot hole, this will not work. Might work with a drill press, but not with a hand drill
From Diamond Core Drill Bit 1-3_SLASH_8-in Dry Diamond Core Drill Bit for Stone Verified Purchaser
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... Read More
No Issues at all! KNOW what your doing!
Would RecommendI 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...
From Diamond Core Drill Bit 1_SLASH_4-in Dry Diamond Core Drill Bit for Stone
Hi Lowe's Customer,
We would love to know some details on the thickness of the porcelain tile, the tool you were using, the process as well ... Read More