SHDIATOOLDiamond Core Drill Bits 1-1/2 Inch for Hard Stone Concrete Marble Granite Brick Laser Welded Dry or Wet Hole Saws 38mm

I was skeptical of a hole saw that attached to an angle grinder. However, It won me over because it was easy to handle, no edge chipping or wandering holes.. It even bored through the fiberglass coated 3/4 plywood underlayment with ease and there was no trouble getting the plugs out of the bit. I was a little hesitant with the price but turned out to be great value for the money.

Liked the overall product, but most of all the length was perfect.

I only had one hole to drill to get a sump discharge pipe out of my foundation. I have precast walls which are about 1.5 inches thick, but it's 5000psi concrete, so it's very hard. I rubbed this bit down with some lubricating oil right before drilling. This worked great, went through in less than 5 minutes without having to pull it out to cool or re-oil. I can't really rate longevity with only one hole drilled, but glad I bought it.

Follow instructions and you will be pleased.

Good quality product

I was apprehensive about buying such a reasonably priced core drill. I needed holes bored in a new 4” thick concrete counter top, out on our patio, but didn’t want it chipped out. I bought this and kept looking at it, worried it wouldn’t work, or worse, I would wind up with ugly holes.. So, I’m here to say, this little core drill, drilled 8 holes through 4” hardened concrete with ease ! I even used my battery ryobi drill to do it. I drilled the holes dry, because it’s adjacent to my new fish pond and didn’t want a slurry on cement getting into the pond. This little bit drilled 8 dry holes using a battery powered drill, in under an hour, with smooth unchipped results !Impressive !Rich…

Cutting hole in one inch thick travertine sink top. Created a lot of edge chipping. Wore out in less than one hole, blew out big hole on bottom of slab. I then used a Lenox diamond hole cutter on same top. The lenox bit made a clean hole with no chipping top and through bottom. I made 3 additional hole with lenox bit, with same results. Bottom line, spend the extra money on a lenox. Unless you enjoy adding extra hours in fixing tear outs.UPDATE: SHDIATOOL has reached out to me and has offered to exchange the bit for one that will cut through a softer stone like travertine. According to them, the original bit purchased is designed for hard stone. Since I already completed the project, they refunded my account. It should be noted that they offered help without me formally requesting it. Therefore their customer service gets FIVE STARS.

Wasn't sure how well this was going to work but was pleasantly surprised with results. I bought two of these SHDiamtool core drills, a 50mm and a 32mm for custom work on sandstone blocks 2 to 2-1/4" thick. I had 12 blocks that needed one 2" hole drilled completely thru and four 1-1/4" holes drilled an inch deep, not all the way thru.These drills do not come with a pilot drill, so I made a template out of plywood and 2x4s with the same hole sizes and layout as I needed for the blocks. That made it easy to be sure the drill didn't skip or wander when making initial contact with surface of stone. I used a drill press with water coolant and checked a core drill speed chart to make sure I was in the ball park for spindle speed - used 1080 rpm for both sizes - and these things cut thru sandstone really well and quite quickly using only moderate downfeed pressure.This pair of core drills performed well and did exactly what I needed - I would buy them again, but they hardly show any wear on them after 12 holes with the 50mm and 48 half depth holes on the 32mm. Make sure you have or buy the correct arbor for them and you should have no problems if you keep them cool with water, use the correct spindle speed and don't use too much down force.

aun no se usa

I cut a 1 ½ inch hole in 2” thick ornamental rock with my small Bosch 4.5” grinder. Used water to cool and wash out the dust. Was amazed at how quick the hole was cut. Excellent bit!!

fonctionne bien avec de l eau

It drills well through stone using water.The theaded connection is not universal.

Excellente conception.Perce sans effort le béton même avec de l'armature d'acier tant qu'on laisse la machine faire son travail.