2" Diamond Dry Core Bit for Brick and Block with SDS Plus Pilot Bit Adapter, 9.5" Drilling Depth

I used this tool to drill through stone and a motor foundation into an addition's crawl space. I encountered no significant issues with it, and it was relatively inexpensive compared to what it would have cost to hire someone for the job. The cutting process took a bit longer than I had hoped, but I ended up making a straight, smooth hole. Overall, the tool is durable and could cut through several more foundations.

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.

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.

Pretty good for the price- got the vent job done 👍🏼

Used this in conjunction with a cordless Ryobi SDS Plus to drill a 4” hole through brick. It did it perfectly. I cannot beleive it actually worked, but it did the job perfectly. It took probably about 30 min to get through, but it left a perfect hole with zero cracks or Spaulding. A professional tool couldn’t be better. Don’t expect super fast drilling, but it will work

I needed to drill a 4-1/4" hole through the brick & wood of my basement exterior wall to run a 4" diameter dryer vent. A local plumber wanted at least $150 to do it and since I already own an SDS Hammer drill I decided to do it myself using this 4-14" hole saw. I started by drilling a pilot hole using a 14" long 3/8" masonry bit. I installed the bit that came with the hole saw and I really cranked it down using a long, SAE allen wrench- it's funny that the wrench that came with the hole saw isn't the correct size- it's too small and I suspect it's metric. Like others who reviewed this hole saw my bit came loose and the allen screw flew away- I'm lucky I was able to find it. If I were to ever need this hole saw again I would probably use the blue threadlock compound. Anyway after the hole saw was about 1/2 in I didn't need the pilot bit anymore since the hole was deep enough to hold the saw in place. So using my SDS hammer drill it took about 40 minutes to get through the layer of brick. That was pretty exhausting but it did the trick. I was hoping to use the hole saw to cut through the wood layer next which was as thick as a 2" joist. It was slow work and I made it halfway through and i gave up and used a wood drill bit around the perimeter and oscillating tool to cut the remainder of the wood core out- Success! Looking at the hole saw after this 1 job I don't know how sharp it still is- I may never use it again but it would be nice to know that it still is in good shape if I decide to for my own home projects or to help out a friend.

12" elevator shaft, even went through rebar! It probably won't make another hole what was worth the money just for this one.

Break on through to the other side!!! Was able to drill through the side of a bank and make an early withdrawal!!! Stacking the bengies over here!

Wasn't even 2 inches into cement block and the sds adaptor broke in my drill. Tried ordering other adaptors for it and they aren't the standard size.