3pcs Concrete Hole Saw Kits, Tungsten Steel SDS Plus Concrete Drill Bit | Concrete Core Drill Bit, Wall Hole Cutter 1-2/11, 1-3/5, 2-9/25 Inch with 8-7/10 Inch Connecting Rod, 3 Center Drill Bits

These are great. I used them on a job today to drill a hole in some travertine. They went through it like butter. They also didn't blow the back of the stone out when it went thru. Definitely worth the money.

I've got a home which I swear was bricked up with bomb shelter rated bricks. I've never had to deal with drilling into anything like it. I used the largest hole saw of the set for installing a new sump pump outlet through the basement rim joist and outer brick. It took me a good 15 minutes to get through it, but this set did fine. As to the bolt and the pilot drill, frankly I don't like keeping them in anyway. Once the hole saw starts biting enough of a hole that it can self guide, I remove the pilot bit, so no issue with the bolt shaking loose. It did the job I needed it for, and the carbide looks fine. I don't doubt that it will last quite a while. The only issue I did run into was after I finished, I did not take the whole saw off the shaft and just chucked it to the side. Methinks it would have been better to pop it loose while it was hot. At this point it's stuck, but I figure I'll just hit it with a torch and break it loose.

I needed this to bore 2 one-inch holes thru the concrete block wall of my house to install a water softener. The first hole passed thru the "hollow" portion of the block and the tool cut thru both sides well and made a fairly neat hole. The second hole lined up with the web in the center of the block and took much longer. But the tool did the job and continued to cut straight. I did have to stop and re-tighten the pilot drill a couple of times and the shank did loosen up in the chuck as well. The tool looks to be in good shape after boring two holes. The only reason I didn't give 5 starts is that I've never used anything like this before and have nothing to compare my experience to.

I was amazed at how quickly these chew into concrete. Excellent quality and design. I choose this product because I wanted the type that has a hex head bolt to secure the pilot drill bit. The pilot bit quickly loosens and the bit and the bolt can drop out in unfriendly places. This could be expected with any brand with the easy solution being electrical tape. Tighten down the hex bolt and put several wraps of black electrical tape over it to prevent any problems. Happy drilling!

I was skeptical about the tool being what they claimed it to be. I was pleasantly surprised. All I needed to do was cut a 40mm hole in a stucco wall so I wasn't looking to spend a lot of money on a hole saw I may only use once, but I'm also a tool nut, so I went ahead and bought it. The brazing on the cutter heads are well done (I'm a welder so I do know what I'm talking about) and the shaft fits a Bosch rotary hammer drill. I'm very pleased and now I can lend it to friends knowing it's not going to fall apart on them.

It got the job done but the hole where off center a bit. And the screw holding the pilot bit can hit the side of the hole and throws it off center and bent the bolt. Going to get a hex screw so it won't hit the side next time.

First time I ever drilled the hole through concrete. The drill bits did a great job. Easy to use and sturdy.

Hole saws worked good going through a foundation. Only thing that slowed me down was the screw they give you for holding in the drill bit. It stuck out too far limiting the depth. I had to cut the screw off and I will have to go back later and cut a slot in it to get it out. Better choice would to include a set screw like most all others do. Otherwise they were good. The threads are so large they won’t work with the other bosh hole saw mandrel, only the one provided.

Son baratas pero trabajan super bien

En o General trabaja bastante bien, lo q no me gustó es que desde el primer uso, ya no pude retirar la broca qie utilice, aplique aflojando, calor y ni así lo conseguí entonces se quede con las otras puntas o brocas más pequeñas sin uso y sin posibilidad de usarlas