Ratings & Reviews for Kobalt Diamond Core Drill Bit 1-in Dry Diamond Core Drill Bit for Stone
Ratings may include incentivized customer reviews.
What Customers Are Saying
Customers praise the drill bit for cutting cleanly through tile, glass, and porcelain without chipping, with most reporting excellent results on demanding projects. Many highlight durability under proper use, noting minimal wear after multiple holes when water cooling is applied. However, some report premature failure including bent shafts or twisting after few uses. Success depends heavily on technique—starting at 45-degree angles with low RPMs and steady pressure yields consistent performance. Despite some quality concerns, most customers who followed proper methods found it reliable and plan future use.
Customer review summary generated by AI, including incentivized reviews.Use water when drilling
Works well as long as you use water with the product
From Diamond Core Drill Bit 1_SLASH_4-in Dry Diamond Core Drill Bit for Stone Verified Purchaser
Use water with the bit
Works well as long as you use a little water with it.
From Diamond Core Drill Bit 5_SLASH_16-in Dry Diamond Core Drill Bit for Stone Verified Purchaser
Fantastic for Porcelain Tile!
Would RecommendI use this bit all the time for shower glass installs. Drills perfect size holes to set the anchors in the tile. No Chips when drilling
From Diamond Core Drill Bit 1_SLASH_4-in Dry Diamond Core Drill Bit for Stone Verified PurchaserVerified Pro
Ok
Would Not RecommendIt will drill, but very difficult to drill where you want to..
From Diamond Core Drill Bit 5_SLASH_16-in Dry Diamond Core Drill Bit for Stone Verified Purchaser
Product was dull and took a very long time to get through a standard tile. Waste of money on this bit.
Don’t bother with this tool
Would Not RecommendJunk. Bought this to drill holes in porcelain tile. Less than halfway thru the first hole the bit had bent enough to make it useless. Took a long time to drill as well. Got a Lenox diamond bit and it went thru the next 3 holes like it was wood. Get the brand name!
From Diamond Core Drill Bit 1_SLASH_4-in Dry Diamond Core Drill Bit for Stone
Does not bite into granite like others al
Would Not RecommendProduct will not bite into granite like others and is slightly out of round causing it to walk and damage product being attempted to make a hole
From Diamond Core Drill Bit 1-3_SLASH_8-in Dry Diamond Core Drill Bit for Stone
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
We are sorry to hear that you had trouble with this hole saw. We would love to know some details on the project so that we can better understand why ... Read More