Hole Saw Kit for SDS Plus, 65mm SDS Plus Shank Hole Saw Cutter Concrete Cement Stone Wall Drill Bit

I'm running a 2" PVC conduit between two buildings and the conduit had to be below grade. First structure is cinder block foundation with poured concrete in the block cavities. Using an older Ryobi 1/2" hammer drill, I got through the cinder block fairly quickly, but it was clear I was going to burn up the Ryobi to get thru the concrete. And the plain chuck of the Ryobi didn't want to hold the SDS bit for more than 30 seconds at a time. For any type of tough job, a drill with an SDS chuck is the right answer. Rent or buy if you don't have one. I decided to invest in an SDS drill because it was still cheaper than calling a pro to drill the holes, and I have future uses in mind. Ended up buying a Bosch Bulldog Extreme SDS Plus. Great tool for a reasonable price. The Bosch with this bit did a phenomenal job getting thru the concrete. Still not any easy job. The hole in the second building was entirely thru concrete. Both holes required 10" depth for the penetration. It took me about 2 hours per hole, but the bit never stopped performing.Tips: Even though I tightened the pilot bolt with a wrench, it would occasionally work loose. I found that a few wraps of masking tape around the bolt and shaft kept it in place well enough to prevent he pilot bit from coming out of the assembly. For faster deep drilling: An SDS chisel bit for knocking out the "core" that forms as you go deeper. Found the bit worked more quickly if I occasionally used the SDS chisel bit to remove the cored piece left behind by the hole cutter. That was easy to do. It also gave the hole saw a little time to cool between drilling sessions.Hard to believe this bit was twenty bucks. And the Bosch Bulldog Extreme hammer drill can be had on sale for just over $150 and should last a casual user a lifetime or two.09/2018 EDIT: After boring nearly 40" of mostly concrete, I've nearly worn out the bit. 4 of the 8 carbide cutters have come out of the bit. It will still cut, but it's slower going, and I expect those remaining cutters won't last more than another hole or two.Do not take this update as a negative. I am not changing my five star rating. I put this bit to an extreme test: Boring 10 to 12" of very hard concrete at a time. Drills bits do wear out. For lighter duty work, this will last a very long time. In this case, doing very heavy duty work, the bit lasted a perfectly reasonable amount of time, completing the work I needed done. Would buy again in a heartbeat if I needed to do this again.

I used this drill to penetrate an old 10" thick concrete foundation 4 times. The tool is still in really good condition.But here's the trick I used:1. I used a hose to run water on it the whole time I was drilling. That kept the tool cool and was probably the most important thing to preserve it for all 4 holes. The water also flushes out the debris and gets the dust and rocks out of the hole. Most of the time around it at a very low flow but when I needed to flush the chips out I turned the flow up a lot higher2. Every 1.5"-2" of depth I had to break out the core. That was really easily done by switching my hammer drill to Hammer only mode and swapping the core drill for a chisel. Take a few hits in the groove around the outer perimeter of the hole and the core will break free. Use the hose to flush the rocks and chips out.3. This set screw that holds the pilot drill in gets loose in about 10 seconds of drilling. Those other people stated some blue lock tight would probably help a lot. I didn't have lock tight so I ended up tightening the screw and drilling the first half inch deep tightening the screw several times in that amount of time. Once I had a good start I took the pilot drill out completely and had no trouble drilling the hole without the pilot drill.I purchased the 220 mm drill and the hole is big enough for a 2-in and pipe to pass through easily with a little room left to glue or grout it in.

I used this one for a hole in a concrete deck, took a little longer than expected but I survived. Also used this same one another day on a brick and block wall. Works way better on brick and block verse poured concrete.

I had to make room for a 2" drain for my outside cabana. This bit had no problem cutting thru 8" cinder block with a 1/4" split face travertine veneer. I rented a 1" roto hammer from HD and was done in about 30 minutes. One thing I would HIGHLY recommend is use water. In just about every case it will ensure the longevity of your bit and quicken the job. I just hung a garden hose and set my sprayer to a "shower" and kept it pointed on the hole. The bit chewed thru the material with no issue. Without water, I'm not sure how I would have fared. Also a quick tip: Put grease on the threads before you attach the bit to the shaft. It will make separating them easier after the job is done and should prevent "cold" welding. For those that haven't used a bit like this, You want to use the core bit with its drill bit piece for only about 1/2" after that(hammer action OFF), take the drill bit out and then just use the core. I still got a little wobble in the beginning, but the cut came out great. I also just took the bit out every 1" or so and the debris came with it (no need to chisel it out). I would definitely buy this again.

I needed to make a hole through a brick wall and this made my job so much easier. Just keep the bit cool with water and it will last a long time.

Good quality and works well. Used it to bore through 2.5 inches of pavers so far and it does not show any signs of dulling. You should run water in the hole while cutting to keep it cooled. When you are done using it for the day, clean it off and coat it with oil. If you don't, it will rust!Packaging was less just OK. There is a plastic tube for the shank and a container for the hole cutter. Mine was shipped with the plastic tube open because the two parts of the tube together would not fit in the box. It appears to come from the manufacturer that way.Other reviews indicate the hole cutter is not centered/balanced. My guess is that they are not using and SDS chuck and the shank did not center in their drill's chuck. I used a standard drill chuck that has 3 pins and there is no way the 4 sided SDS shank will center in it. It's not a horrible shake, but keep this in mind if you plan to use a drill with a standard chuck.