Customer Reviews for VEVOR Core Drill Diamond Dry Coring Bit 4" with Pilot Bit for Hard Concrete

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!!

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.

Worked perfectly and even cut through the steel reinforcing rods embedded in the blockfilled concrete walls . Top product , even the tradies were impressed.

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.

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.

Works Great and would recommend it to all! Even came with a grinding disc that was easy to use! Glad I made the purchase! Thanks Vevor. Dont know what I would do if I had not bought this item! So happy that they find these items and make them available to us that are not in that business!

My original review was pretty harsh. I am updating it because I figured out how to get it to work.I drilled a large pilot hole with a different bit. Then I cut a hole into an old piece of wood to use as a guide and screwed it into the wall. I got through two layeres of brick fairly easily.The cutting disc it came with was pretty good.

It does its job if you have enough power behind it.Cuts a nice round hole as a cylindrical cutter should. I was coring in hard south Texas caliche. It was rough going with an old SDS drill. The SDS MAX is the MINIMUM you should use with this. But it does cut, I drilled 3 holes so far.

Seems quite good quality, did the job no problems. Excellent price for what you get. You can't get one of these for under $100 anywhere else.

Couldn't use this - the fitting is 5/8" and the drill has a 1 1/4" Check the size when you purchase - I just assumed they were all a standard size :(