ZELCAN Hole Saw Kit, 4pc Drill Hole Cutter Set with 30 50 65mm Hole Drill Bits for SDS Plus Hammer Drills, Circle Drill Bits Hole Saw Set for Concrete Brick Cement Stone Wall Drilling Home Improvement

I am IMPRESSED! I had to drill through 12 inch cinderblock from 75+ years ago and was extremely tough. The cinder block back then wasn't like the stuff you find today that is easy to drill through in comparison. This stuff was thick walled, had large chunks of actual rock aggregate, and was a tough challenge. The 65mm bit went through it with ease with a Bosch drill. I didn't need to use the hammer setting it did such a good job. Super clean hole right through the block on both sides. I did a separate drilling job on a poured foundation and used an $85 wet/dry diamond bit and that was much harder to do. My guess is this bit would have done the job better than that bit. TIP: Many people talk about losing the pilot bit set screw. I wrapped a little bit of plumbers tape around it and it did not fall out at all and was still just as tight when I installed it, and removed easily after the job was done. The downside? The bit gets stuck onto the shaft. I didn't have an o-ring so I wrapped some plumbers tape around the shaft hoping it would allow me to remove the bit after drilling slightly easier, but it has proved to not help and I still haven't gotten the bit off the shaft. I tried in a bench vice and pipe wrench quickly, but the shaft is perfectly round so it just spun. I'll get back to trying again. At this point, I'm stuck with the shaft and 65mm bit, and have no way to get it off the shaft and can't use the other 2 bits. If I find the time and get the bit off the shaft I'll come back and update this review and share how I got it off.

I used this to core a hole through a brick wall to install a mini-split air conditioner. The cutter went through Sheetrock, OSB and brick with ease. I did have to clear the brick trash from the hole saw, but that's to be expected, as the bricks are wider than the saw depth. Several reviews stated that the set screw came loose during use. Mine did not come loose while I was using it, but the pilot bit did fall out while I was putting it away. Please follow the suggestions to use some thread locker on that. Also, please note that the pilot bit has a flat spot machined into it for the set screw to press against. If you aren't putting the set screw against that flat spot I'd assume you are going to have problems. Highly recommended and would buy again.

I needed to drill a 2" hole thru a concrete wall. I used this item and it did the job. It cut thru the concrete with no problem and as long as you pull it out occasionally to clear the debris it worked great. The issues I had was the Allen screw holding the center drill fell out, so you need to check it while using and add some loctite thread lock. The other issue I had was once I was done I could not remove the saw from the spindle. There are holes in the saw where you can insert a screw driver to turn it but the spindle is completely round and just spins around in the vise I was using to hold it. They need to machine in some flats on the spindle to prevent it from spinning and allow you to use a wrench to hold it. The saw itself held up great, the carbide cutters still look new.

Overall I been very happy with the kit. It is a great value compared to the big box store’s options. I found the items to be well made and work as intended. Some helpful watch outs / suggestions: Add some never-seize paste on the shaft threads, as removing the hole saws can be tough after long drilling. Another, is to add lock-tight to the set-screw as it tends to loosen or fall out. In a pinch, I wrapped electrical tape around the shaft covering the set-screw and then put a slice in the tape at the screw. This way I didn’t lose the screw and I can re-tighten it through the slit. Finally I would like to thank ZELCAN for their great customer service with an issue I had with one of the hole-saws. They were very quick to respond and resolve it. More importantly they stand behind their products! Finally, I am so impressed with this kit that I bought one for my son to have for his jobs.

I bought this set to bore a couple holes thru my brick& concrete wall on my house. I had to run a gas line and a water line for my BBQ and my irrigation hose bib. The hole saw worked perfectly. a COUPLE THINGS TO NOTE ABOUT THE PRODUCT>>>>> (1) I was impressed with the packaging. the drills were individually packaged in their respective plastic holders. The kit comes with three masonry hole saws, mandrill, pilot bit (I'm not sure way another reviewer said there was none?) and an Allen wrench to set the pilot bit in the mandrill. There is a flat keyway that the set screw needs to set in the keep the pilot bit tight. (I'm also not sure where the other reviewers said the pilot bit loosened up?) (2) Prior to boring my holes, I put a little bit of white grease on the threaded end of the mandrill and then tightened the hole saw bit to the mandrill. I had no problem removing the hole saw after I was done. I only need to use my channel locks to get the hole saw off the mandrill. (3) IMPORTANT!!!! This drill set is not for use with a standard 3 jaw drill chuck. It is intended for use with a SDS rotary hammer set up. If you attempt to use any of these bits with a standard three jaw chuck, it will wobble and the drill will not stay centered. Buy or rent a smaller rotary hammer to use with these bits.

If you just need a bit for a few holes in some concrete block (not solid concrete), then these are just fine. You'll accomplish the goal reasonably quickly and for a decent price. But if you're looking for a set of bits that stay in your toolbox for frequent cutting, these are not it. Their quality isn't that great, and they probably will start to give you grief fairly quickly. I found that the biggest issue is that the center pilot bit keeps falling out, often on the other side of the wall, or in the wall (for concrete block). No matter how hard you clamp down the screw with an allen key. When I first got these I only needed about 3 holes, and it worked well. Then a few months later I needed another dozen holes, and that is when I discovered these weren't the greatest. But hey, the job got done and for the price, having some disposable bits is ok with me.

Did the job. Went through double brick wall without the hammer part of a drill.

I wasn't expecting anything good but worked better in my price range so happy. I am disappointed that only 1 hole and shows wear in the cutters. A few are new while others are worn out. To the point they are flat to my eyes. I was expecting 2 to 3 holes before this for the price. You decide on picture I supplied. I'm not saying it's that bad according to price. I did not experience like others of little screw losing, or bit falling off. I was drilling 1924 pure concrete so maybe that did it. Update May 9. Reason why wearing fast than expect there was a rebar. It did cut through but was a very slow process. So updating from 4 stars to 5 These pics were before I noticed there was a rebar

Buena calidad, para uso rudo, muy versátil

Lo utilizo para instalación de mini split

Did the job, 65mm hole in ~6in concrete.

Es ideal para perforar

When used in my SDS hammer drill, this worked perfectly (and still looks new) after 2 2.5" holes drilled in 10" of concrete. Would buy again.