Review on 9.5" Diamond Dry Core Bit For Brick And Block With SDS Plus Pilot Bit Adapter, 5/8"-11 Arbor And 9.5" Drilling Depth - Perfect For Concrete Drilling by William Turner

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.