Ratings & Reviews for Kobalt Diamond Core Drill Bit 5/16-in Dry Diamond Core Drill Bit for Stone
Ratings may include incentivized customer reviews.
What Customers Are Saying
Customers praise the bit for delivering clean, chip-free cuts through porcelain, ceramic, and glass tile, with many reporting 8+ holes without noticeable wear. Success depends on proper technique: starting at 45 degrees, using water for cooling, maintaining low RPMs, and clearing debris. While most users who followed these methods achieved excellent results, some encountered durability issues like bending or grinding down, and a few struggled with initial hole starting on smooth surfaces. Overall, reviewers recommend it for those willing to use correct drilling practices.
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.
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..
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
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