CONFAST 3/16" x 2-3/4" Hex Head Concrete Screw Anchor with Drill Bit for Anchoring to Masonry, Block or Brick (100 per Box)

First time drilling into concrete. These worked great.

Have ordered multiple times! Great quality

The drill bit wore out after 2 and half holes in a concrete floor that is >35 years old, and I had to order another drill bit.

I live in SW Florida in a masonry new home. Needed these to hand curtains. Worked flawlessly and description of drill bit helped. I had a hammer drill with bit so much easier to install. Perfect size for my situation as well.

Use the 4-in screws on stucco work great thanks

Needed to mount some items to the concrete and the price was very competitive versus the local hardware stores. The included masonry drill bit was an added bonus and it worked well to drill into the concrete. I was able to mount my item and it seems to be holding. Only time will tell if they last, but they seemed to work properly.

I used this to repair a corner pop on my foundation. The original material was lost so I had to form a new one. I used this anchor screw to provide support for the new corner. I drilled into the old concrete, added in an epoxy for anchors, placed the screws tightly, let it dry, setup a form, then troweled in the new concrete. Repair looks good (professional even), and seems very stable (time will tell).To determine the correct size, you need to decide how deep the screw will be set. I wanted mine sticking out by 1.5 inch to act as rebar for the concrete, and drilled about 1.25 inches deep into the existing foundation, so I used 2.75 inch long screws. If anchoring other material, then consider it's width plus the depth you want the screw to be drilled. Be sure to use an anchor epoxy for a permanent fix.A note about drilling the holes for these screws: There are a LOT of drill bits advertised as good for concrete, they aren't. You need a fairly long bit (longer than the length of the screw to be set in the concrete) and it needs to be a REAL CONCRETE DRILL BIT - like the "Bosch BM5000 Fast Spiral Masonry Set". You must use the correct bit width or you can damage the concrete (if too narrow a bit) or the screw won't hold (if too wide a bit). Length is really difficult to get right if you are working in a confined area, so take that into account. If you have a wide open work area then you need to determine how deep you want to set the screw and be sure you have a slightly longer bit - put a piece of tape on it to show how far in to drill and when the tape aligns with the concrete you stop. If you have a really confined area like I did, you need to also determine how much extra bit you need to fit into the area to even reach the drill drill point (I could get the drill about 2 to 3 inches away from the drill hole and no closer). This means you have to add that much to the overall length of the bit for your project to work. Finding long enough masonry drill bits can be a real problem.

In the past, I have used similar screws of another brand in block walls and other masonry with good results. I bought these to attach framing to a poured concrete floor in my 70 year old house. Using the provided masonry bit and my hammer drill, I had no troubles drilling pilot holes in the concrete. However, most screws would not go all the way in before either breaking or rounding out the head on the screw. So, while they may be a great product for other types of masonry, they are not a good product for well hardened poured concrete.

I like the fact that it came

En las especificaciones RECOMIENDAN utilizar broca de 3/16" sin embargo a mí no me funcionó así, quedaban bailando con tornillos, tal vez por el tipo de material, lo mismo ocurrió con los TAPCON, ambos incluyen sus brocas pero no logré el efecto deseado por lo que decidí ir por una broca más pequeña.En este caso ocupé una broca SDS de 5/32" y el efecto logró ser el esperado, algunos tornillos siguen girando al llegar a tope (por extracción saldría con mucha facilidad) con esta combinación de broca y tornillo quedó muy sólido.

I planned on using these screws to drill into concrete. I didn't use the included bit but my own 5/32 SDS bit to predrill the holes. I then used a cordless drill to screw in the fastener. On the first screw the head broke off. I thought maybe it was a bad one so I tried another screw and the same thing happened. I switched to a lower power drill and went at a slow speed and the screws kept breaking. After drilling eight holes and having eight screws break I gave up. I had a few Tapcon screws left so I used them with no problem. Not only are these screws poor quality they are dangerous if you plan on using them for anything that you don't want falling down when the screw snaps.

These screws are fantastic. No plugs to come out at some fateful day in the future. Simply drill a hole and screw them in. And forget. I recently removed some of these screws, from an open air environment, that they'd been in for some twenty years. They came out with the ease that they went in, and virtually free from any rust or corrosion. The screws being in a fit condition for use elsewhere. Being hexagon head, they're very robust against insert tool damage, unlike the Philips equivalents.

As long as you are careful choosing the correct drill, then these screws are superior to screw and plug.