VEVORDiamond Core Drilling Machine, 4in Handheld Wet Concrete Core Drill Rig, 1100-2400RPM Two Speed & 1-1/4" Thread & 2 Bubble Levels, 3-4in Drilling Diameter for Concrete Brick Block Stone, 1500W

This drill works great. I am a first time core driller and was skeptical of the low price point compared to name brand units. I purchased a separate 8" bit and drilled thru 9" of concrete and rebar with no issues. I took advice and drilled very slowly especially when I detected the rebar. I also used 1/2" tap cons to fasten the drill to the concrete which I HIGHLY recommend. The drill itself is of high quality and comes with everything you need.

I used this today to drill 4 holes through a stone foundation in PA. I have no idea what the exact name of the stone is but there' a reddish field-stone that is so hard it's like granite and I was able to do the holes 100x easier than the old way I would have done it which is to use a hand-held core drill. This was so much more pleasant to turn a crank rather than hold the drill and safer too.One imperative tip for anyone using this core drill is to fasten the drill base to the wall or floor using multiple bolts. If you only use one anchor it will slightly deflect while you're drilling and the bit will bind. With multiple anchor bolts (I used three 3/8x4" tapcon bolts) the base will not deflect and the drilling is very easy. If your wall is greater than about 18 inches thick you will need to stop mid-way and add an extension. The bits tend to cold-weld to the drill spindle and the way to fix that is to put a giant adjustable wrench on the core drill bit and hit it hard with a drilling hamer to shock it and it will unscrew. It needs to be a really hard hit, plan on the wrench to go flying during the process but it will separate the bit from the spindle.

I purchased this because it was about the same price as a rental without all the hassle and then I would have the tool if I ever need to drill another hole. And it worked. Very well. But a few things you should watch out for if you are new to this work. First, a 4" dryer vent needs a 4.25 inch hole. Not a 4" hole. I suspect this is the perfect size for a metric country with metric ducts, but if you are looking to install a 4" dryer, the hole will be really tight and it will be hard to insert the exhaust cover let alone get the duct through the hole. The seller was absolutely clear on the hole size, but the customer (me) did not appreciate its significance and it is really hard to make a hole larger!The second issue is that the spring on the trigger is pretty strong. My foundation was 12.5 inches of poured concrete. It took quite some time to drill the hole (with breaks) and by the end my hand was cramping. Clearly more time in the gym and less writing Amazon review would probably help. One solution might be to have a lock, but with the potential for the bit to bind, this could be quite dangerous. I think a softer spring would be best solution.This brings me to the next concern. There does not appear to be a clutch on the drill. Twice the bit bound in the hole and it is quite powerful. My hole was 6 inches above ground so this was not a risk, but if I was on a ladder, it could have been quite scary. So definitely don't get the bit out of angle or you will quickly find the drill twisting out of your hand.Starting the hole can be tricky because the bit is water cooled and does not have a pilot drill to hold it in the center. To address this, I cut a 4" hole in a piece of scrap wood and rested the drill in the hole until it started to cut into the wall. This avoided the drill from wandering as it spun and before it started to cut. This take a bit longer but is worth the time!Speaking of water cooled, as some of the comments mention, the drill comes with a fitting that probably works great in China, but for which no US garden hose can attach to. I don't event know what it is. It looks a lot like the quick connects they have at HomeDepot, but it is a different size and does not stay connected. The fitting the male connector screws into is not tapered and is metric. So unless you have access to metric plumbing parts, you will need a 1/4 inch brass fitting and rely on it to cross thread (which it will with enough tape) and then a bushing and finally a garden hose connector to allow you to connect a US garden hose to the drill. The fitting is stainless steel so brass will deform nicely and work. Don’t use steel! This is a simple trip to Lowes or HomeDepot, but will set you back another $30.Last point is that this drill is heavy. If you are young and fit this may not be an issue. But it takes time to drill through any strong foundation and you will have to hold this drill quite steady for a long period of time or it could bind. So take lots of breaks, see if someone can spot you for a time or two so you don't make a mistake.I don't regret the drill, but do wish the 4 inch bit was a quarter inch larger. Given the hassle with getting the duct through the hole and converting it to work with our garden hoses, I would probably rent one next time since I only needed the one hole. But if you can work with a 4 inch hole or are using the smaller bits for irrigation hoses or wires (and they work with that diameter) and you will want to work over several days (like most DIYers), this is definitely worth getting because renting over multiple days is quite expensive.Hope this helps.

I used this to drill 6 4" holes through a 18" thick rock wall to help drain a parking lot. I have to admit I didn't have much hope for the bit that came with the machine. But I will admit my fears were misplaced. The flexibility of not being stuck to a stand allowed me to position the drill on an angle. The bit lasted all 6 holes without having any of the "teeth" break off. And other than having to reset the saftey gfci switch numerous times, it kept tripping because of fractured peices of stone making the bit get stuck, this drill worked amazing well and at a really reasonable price point.

The media could not be loaded. This is not a toy. I saw the review of the guy getting injured with one of this equipment and I just want to say that, if you are not sure about the property operation of this machine, get someone else to do the job. Make sure your fasteners are properly secured and the machine is properly aligned, put yourself as far as you can from the machine in case it jammed and wear the right protectionThis machine does a pretty good job and is definitely worth the money if you do not need to core bit every day, if you need something for daily use get a hilti or something else because this toolIs good for occasional usage

Really easy to use

this drill has no kill switch or trigger only an on / off switch making it very dangerous. I will never use this again!Nearly broke my ribs, arm and knee, the drill got away from me, and I wasn't able to shut it off it twisted me up causing a great deal of damage and pain.This drill needs a dead man switch or a release trigger I'm really sorry for purchasing it