9PCS Concrete Hole Saw Set,Tungsten Steel SDS Plus Shank Masonry Wall Hole Opening Drill Bits for Brick, Concrete, Cement Stone

Works really well truly happy. A screw broke during use kind of stucking the whole saw to the shaft. But that's the size I use mostly so it's not a concern now. But yea great.

I used these bits to drill through my 12 inch thick foundation to install some pipes. I would recommend picking up a SDS-Max hammer drill to do the job. I used a smaller SDS plus drill and although it worked, the larger size would have likely made the job much easier. I used the two smallest size bits and the largest bit and they all worked perfectly. I was considering renting diamond core drill bits and drill to complete the job, but buying these bits and a drill from Harbor Freight proved to be cheaper and now I have these tools to use in the future should I need them. Very happy with these bits. Just take your time when drilling. Use the hammer drill setting on your drill.

If you aren't using these on daily basis, the kit is cheaper then renting or purchasing more expensive independent bitsDrilled three 5" holes through an eight inch concrete slab plus smaller holes. The 5" dod do the job but lost several teeth.Understand that they are made for smaller jobs anf will pay off for that purpose.16thReplace the 6mm screws, with higher rated screws

Really good product Ive used it to drill a 3 in hole trough a 6 in concrete wallWhen trough in about 30 minutes

I have used this only to drilled 3.5" hole in concrete block, and it easily drilled the hole. Works great.

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I purchased this core drill set just a couple months ago. I used it on a project just a few days ago for the first time. Using the large SDS shank extension, and the middle 2" core bit, I was drilling through a soft red brick and broke the shaft 1/2 way through the brick. The drill was a dewalt hammer drill for the large SDS drive. Drill "was not" in hammer mode! I don't drill core bits in that setting! Unfortunately, I have had the kit too long to send it back. Be sure and try this stuff right out of the box. Don't assume it is good great equipment when it arrives purchased from a picture and description.

The big cups measure less than the measurements it says on the cover.Very disappointed.