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Customer Reviews

  • 4.8
  • 4.6
  • 4.6
  • 4.7
G. T. Bauer G. T. Bauer
4 inch
I bought this with the intention of drilling a single hole through a hollow concrete block for a dryer vent. For that purpose, it worked like a charm. I was able to get through the front half off the block before burning out my cheap 20 year old drill. Another better drill finished the back hole.I saw one review that said the drill bit was too short. That was not true for me.I cannot speak to the longevity of the bit, but for the single hole I needed, this was a great value.
4.25 inch
Make life rasy
We were boring through concrete. This bit make it easy and effortless!
Customer Customer
4.25 inch
Works great. Use a wood template. Duh.
Ag Ag
4 inch
Core Big
Great looking drill bit, especially for the price. Teeth a little thinner than expected, but will give it a try.
Terry Singleton Terry Singleton
4 inch
Good product
Good product would recommend to anyone
Larry Jenkins Larry Jenkins
4 inch
My job I purchased it for has been delayed.
I’ve not used the coring unit yet, but that free 4” Diamond disk is dynamite; I’ve used it 3-times now, very impressed.
3.5 inch
Worked to core a 8" solid concrete wall.
I used this to core a hole through a solid Concrete Basement wall for a Split Unit A/c.....took about an Hour...with a smaller Bosch Rotary Hammer......I only used the Hammer feature occasionally....and Drilled it Dry...Excellent Product!!
4 inch
Easily bored through a 3 wythe red brick wall
The core bit cut though the brick without much difficulty. The pilot drill however does stay lock into the adapter regardless how hard I tightened the hex screw it always wobbled free. Only used it once so no real review on longevity or durability.
Brian d Petroff Brian d Petroff
6 inch
This bit doesn't work with drills sold on this site. The receiver on this bit is only 5/8" and the drills sold on this site are 1 1/4" arbor.
Thomas Thomas
4.5 inch
Perfect size hole for 4" schedule 40 PVC. 20 minutes for 5.5" bore hole.
Using this 4.5" diamond core bit, I was able to core through 5-6" of 50 year-old concrete in a retaining wall in about 20 minutes. I did run a garden hose to slowly spray into the hole/gaps for wet-drilling, which seemed to help quite a bit. NOTE: this 5/8"-11 bit does NOT directly fit the Vevor Diamond Core Drill that I bought it with, which had a water valve built in, and that was a bummer. So, be sure if you're using this bit, and also buy their common Vevor 1800W Diamond Core Drill (which has a 1 1/4"-7 output shaft), that you also buy the proper adapter, which can be found on Amazon for about $30. The Amazon title of the one I bought is: "Shaft Adapter for Core Drill, 1 1/4"-7 Female to 5/8"-11 Male, for Use with Diamond Core Bits" That still won't allow you to use the built-in water-jet of that drill, but perhaps you can just setup a hose to spray into the hole like I did. Also Note: You will not find a 5/8"-11 adapter that has threads long-enough to fit deep enough into this bit to work properly with a strong regular mixing drill or SDS drill (don't use hammer function though) at Home Depot or Lowes, though those adapters can be found on Amazon as well for $10-$15, but be sure if you go that route that you get one with more than at least 5 rows / 1cm of thread or more so it sets deep-enough into the bit to handle the torque needed. (I did find a 5/8-11 - drill adapter at lowes in a kit, but it only allowed maybe 2 rows of threads to insert, and it stripped those threads out after 5 minutes of drilling (as I predicted, but had to try), before I ordered a better option off Amazon). Still, despite the adaption issues, once those were solved and the right adapter was bought, this bit worked great. Oh, last note- I'm just a regular homeowner with DIY skills and this was my first time coring a large hole like this. I did a lot searching online as to whether 4.5" would be large-enough for 4" schedule 40 PVC pipe, and most sites recommended a 5" bit, but I'm very glad I used this 4.5" bit instead, because the hole size was absolutely perfect, and required no filler like what would have been required had I drilled a 5" hole.

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