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Your cart is empty.Dry diamond core bits with #30/40 diamond grits includes SDS Plus pilot bit adapter and is designed for drilling soft brick or building block. 10mm segment height with 9.5" drilling depth. 5/8"-11 arbor size, use wet or dry with dedicated core drills or core drill rigs in rotary mode only.
Daniel LB
Reviewed in the United States on February 20, 2025
I needed it to drill a hole through concrete floor, it worked as intended even though it says that it is not made for that. Just be gentle and it will do what you need. Not sure how it would hold in the long run but if you need it for your business you shouldn't be reading this anyways!
Customer
Reviewed in the United States on February 2, 2025
heavy duty perfect for drilling 4 inch core holes this tool was used for drilling a hole into a stucco framed house for a dryer vent system clean quick and left a professional finish.
John B
Reviewed in the United States on January 6, 2025
Does not work if concrete is in blocks or behind brick. Read carefully.
CF
Reviewed in the United States on January 26, 2025
Needed to drill a uniform hole in our basement slab for the radon unit. It cut very fast and smooth using a Makita hammer drill (did not use the hammer setting). Worked great.
J. A. Diaz
Reviewed in the United States on June 30, 2024
Needed to drill through insulated concrete blocks to add a 4-inch vent for small room refrigerated air unit. After mapping out potential locations for rebar using a handheld wall metal detector, I used my hammer drill to drill the pilot hole. I attached the long drill to the 4" hole saw, and proceeded to drill, and this worked very well throughout entire process, probably took me 30-mins w/breaks in-between. The hole saw worked flawlessly. I am fairly sure this hole saw can drill many more holes, it seems very well made and durable.
AzonMember78
Reviewed in the United States on May 22, 2024
Bought this to bore (8) 4” holes in the side of my ICF house(6” thick poured concrete). Started with the pilot bit but then removed it to avoid binding issues. The upstairs has pink bar in the walls and I went through 2 of those on the 3 holes needed. No problem. The downstairs has steel rebar and I avoided those using a metal detector. It took a LONG time to drill all 8 holes but this bit is still usable(3 hours per hole!!!). The bit is clearly marked that it is not for concrete. But, it worked. I WOULD NOT recommend using a core bit of this size with a huge drill unless it is properly braced. I had to drill these holes on a ladder by hand. My Bosch bulldog(the long one, not the huge squaty one) will break away if it binds instead of breaking your arm. All holes were dry. Keep the dust out of the holes about every 1/4” and it will keep cutting.
Sam
Reviewed in the United States on October 23, 2024
This bit did a great job going through my 7 in poured concrete foundation wall. I took it real slow and used water. It took about 90m of drilling time but it made a great hole for very cheap. Plus the bit seems like it’s in good condition to do more! More than I expected, and I’m very happy I didn’t let rent much more expensive equipment.
Customer
Reviewed in the United States on May 11, 2021
The arbor broke while I was drilling the first hole. I made it 2” deep through a 5” thick concrete floor. That’s it! I had to drill a pilot hole with a different drill bit because the Allen set screw kept loosening. Once I was a 1/2” deep with the core bit. I removed the pilot bit that came with it. Made it an additional 1.5” before the arbor broke off inside the SDS drill. There was enough metal left on the arbor to use it with a hole hawg to finish the 1st hole before I trashed it and kissed that $$$ goodbye.
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