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.Worth the cost
Would RecommendUse it to cut through many projects and still working great.
From Diamond Core Drill Bit 1-3_SLASH_8-in Dry Diamond Core Drill Bit for Stone Verified Purchaser
Herculean!
Would RecommendThis Kolbalt Hole Saw does its job! I used it to drill through my granite counter top to add a new soap dispenser and it cut out the whole block perfectly and with little effort. Now know this, it takes some amount of physical force to cut through granite; but this little hole saw is clustered with diamonds at the mouth end to do its job timelessly. It took about 3 to 5 min to make a superb hole cut!! The block of granite was exactly, the same size in depth as the hole saws mouth. You just c...
From Diamond Core Drill Bit 1-3_SLASH_8-in Dry Diamond Core Drill Bit for Stone Verified Purchaser
Works best wet, start slow and at an angle.
Would Not RecommendWorked ok, not amazed. Took a long time to cut tile.
From Diamond Core Drill Bit 1-in Dry Diamond Core Drill Bit for Stone Verified Purchaser
Will break a few tiles
Would Not RecommendNo directions and store employee didnt know if it worked or not
Verified Purchaser
This bit wanders a lot, you have to really brace yourself and introduce it to the tile very slowly. I needed to drill 8 holes, it did 3 OK and barely got through the 4th. My wife used a spray bottle to keep the bit wet while I drilled. I will buy 2 more bits for the remaining 4 holes.
Excellent tool
Would RecommendVery good bit for drilling hole in Granite counter. Works great.
From Diamond Core Drill Bit 1-1_SLASH_4-in Dry Diamond Core Drill Bit for Stone Verified Purchaser
Detailed Review
Good for Lowe’s
Would RecommendI used this once so far. It was to cut a hole in a wine glass. Used with water and a template I made to keep the bit steady due to no arbor. Worked great, let the drill do the work. No casualties.
From Diamond Core Drill Bit 5_SLASH_16-in Dry Diamond Core Drill Bit for Stone
We would love to know some details on the material you were cutting so that we can better understand why our hole saw did not perform to your standar... Read More