BINOTA Concrete Hole Saw, Kit 40 55 80 100 110 130 MM, Arbor SDS Plus and MAX 300mm, for Masonry Cement Wall Brick Sands Stone Sable-Rock Self-Leveling

I needed a tool for drilling holes in 8" thick poured concrete basement walls for installing a radon system. After searching a number of products and checking reviews, I picked this set as it offered several hole sizes and 2 drive shafts (SDS and SDS Max). I opted to run the 65mm hole cutter based on the size pipe I was running, and wanted to start with smaller hole and only go larger if needed. For the drill motor, I used a HF Bauer 1641E-B SDS rotary hammer.I started the hole using water to flush the dust out of the hole, but this made a sticky sludge that coated the cutting teeth, made a bit of a mess, and slowed down the process. I only ran the drill at about mid speed, so the cutter never got more than a little warm. I cleaned the hole and ran the cutter dry from then on, using a utility vac to keep the debris evacuated. This sped up the process. Overall, it took me about 3 hours to go the 8-9" thru the wall. Again, this was some pretty solid concrete. The cutter never stalled, but it was a slow, steady process. The resulting hole was a little oversize (approx 70cm) but this was reasonable. You will have to stop every so often to chisel out the center concrete as the cutter only cuts the perimeter of the hole. This is the case with any cutter of this depth. The cutter length with the shaft length was plenty to cut the 8-9" thru the concrete wall with a little depth to spare.I had to drill a second location wall hole a few weeks later. As before, I scanned the wall with a metal detector to avoid hitting any rebar. I ran this hole dry, same mid-range RPM, and evacuating with a vac. Only took about 2 hours this time, same wall thickness. After finishing the hole, I inspected the cutter and noticed a couple of the teeth had broken off. Not sure when this happened as the cutter performed consistently and never seemed to slow down. Hole was very clean, no rebar contacted.Since I didn't need a whole new set, I contacted the vendor and explained the nature of the drilling, and asked if I could buy just the 65mm cutter. They very graciously sent me a new cutter and SDS shank (at no charge), which then got lost in shipment. When the vendor found out, they sent another cutter and expedited at their own expense. This is exceptional customer service.Finally, for those considering this set- I used it on a vertical poured concrete basement wall. It is difficult and slow, no matter what cutter you are using. This tool would be faster in hollow cement block, or drilling thru a slab. In any type of poured concrete drilling, do yourself a favor and use a metal detector to avoid hitting any rebar. I am a mechanical engineer and know how to get the most performance from the tools I buy, and I was impressed with this set, even though I knew the job would be a challenge.I'm not easily impressed, but this product and especially the vendor impressed me a great deal. I will definitely buy from them again. My reason for leaving such a detailed review is that it was a struggle finding adequate information about these cutters when I was searching. Finally, this set also includes an SDS Max shank as well as the SDS shank I used. Both are approximately the same length.

Excellent quality and complete. Well packaged. Not yet used it.

Works well but Ill need to use some loctite on the set screw for pilot bit. Constantly backs off and being an Allen key screw, it naturally is wearing the quality of the insert

The key to cutting concrete with such a large bore is to:1) Cut small relief drill holes around circumference2) Use dripping hose to keep cool with water3) Use rock chisel to break up center bore core every inch to lessen fiction

They work pretty well if you use them cautiously. I’ve drilled a handful of holes in solid concrete and brick and they hold up ok. In order to get maximum life from these there are some tips to consider but not everything about these was good. The case is rather flimsy and likely won’t last long and the foam insert is cut too deep for the center bits and shanks making them difficult to remove. The bolt that holds the center bit in the shank will not stay tight for very long: after about a minute of hammer drilling it falls out and the center bit gets stuck in the work piece. Some tips for better usability: 1.) Pre-drill the center pilot hole separately to reduce stress on the center-bit retaining bolt. 2.) Use these core bits to score a shallow (1/8”) groove in the surface of the work piece. Then use a small concrete bit to drill a series of small holes in the newly created groove (around the perimeter of where the hole will be) all the way through the work piece. Then come back with the core bit and finish the final drilling. 3.) When using the larger bits, drill a little more slowly and take sufficient breaks to allow the bit to cool. 4.) Be sure to use the hammer function for best performance. 5.) Chip-out the core material frequently (after every 1” or so of depth) to prevent sticking

I need this bit to drill through a brick wall. Haven't used it yet, but it looks like it should work. I just hope it can make more than one hole without dulling out on me.

Update: I have now cut through at least 120" of concrete with this set cumulatively. The cutter head had held up very well. The only part that is not well designed is the drill bit getting loose often. For the price, it is absolutely worth it.Original review.They lasted well I think. I have cut a good number of holes in our 12” foundation wall with the smallest bit and it is still holding up and teeth are intact. I’m happy with how the durability.The only down side is that the screw holding the drill bit undoes itself frequently. Not a dealbreaker to me.

I used this bit to drill a 4 1/4" in hole in cinder block for a dryer vent install using a Bosch Rotary Hammer Drill. As others have stated, the pilot bit did come loose a few times, so after I had gotten about 1/2" deep on the core bit, I removed the pilot bit and carried on. The core bit worked very well for my needs...no broken teeth (on the bit). A start/stop to allow for some cool down seemed to work fine. Overerall it took about 40 minutes in total to go through both sides of the block. Definitely recommend a mask, eye protection and hearing protection for safety!

The set screw that hold the bit in extends past the body of the hole saw which only allows the bit to go into the wall as far as the set screw. Makes the long extension useless.

bon produit, il a fait le travail Good

Me parece de muy buena calidad

Bien

Ho acquistato questa fresa a tazza da 115 mm per realizzare quattro fori di 115 mm di diametro e 400 mm di profondità per l'areazione in mattoni forati. Sono estremamente soddisfatto del mio acquisto!La fresa ha svolto il suo lavoro in modo impeccabile, permettendomi di ottenere fori precisi e senza sbavature. La qualità del materiale e la robustezza della fresa sono evidenti, e ha dimostrato di essere all'altezza delle aspettative, affrontando il compito senza alcuna difficoltà.Inoltre, il prodotto corrisponde perfettamente alla descrizione, senza sorprese. È stata un'ottima scelta per il mio progetto e consiglio vivamente questa fresa a chiunque abbia bisogno di uno strumento efficace e affidabile per lavori di perforazione in mattoni.In breve, un ottimo prodotto che ha reso il mio lavoro molto più semplice!