CONFAST 1/4" x 3-1/4" Hex Head Concrete Screw Anchor with Drill Bit for Anchoring to Masonry, Block or Brick (100 per Box)

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.

A bargain price for 100 that also includes a solid masonary bit when compared to name brand prices and performed just as good. I bought extra bits and you can see I never opened the package. Bit took a beating without being changed while drilling over 48 holes into grout in between bricks in the columns that support my home. 4 of the holes that I drilled didnt tighten up but was easily remedied by using a larger 1/4" scew. Never snapped any heads off. Would by again. Very pleased.

I don’t know how any screw bites into concrete, but these do it. The key seems to be pre-drilling with a bit one size smaller than the screw’s diameter. With a 1/4 inch concrete screw that would be a 3/16 inch concrete drill bit, and so on.

Bought these 2 weeks before hurricane Ian hit because I had a bad feeling about hurricane season. Well unfortunately I was right and we were hit by hurricane Ian. On the day of the hurricane it made a turn toward Fort Myers and we needed these to put up our plywood. These all worked perfect and held through the storm. We only broke 1 screw off while mounting the plywood but that was my fault for not setting the clutch on my drill on the first bit. Every other screw went in like they should and came out the same. I highly recommend these anchors as they didn't let us down. All windows were protected. Too bad I can't say the same about our roof but these screws had nothing to do with that loss.

Excellent product and service. Will buy from them again.

Great product and an amazing value vs what is sold at the big box home improvement stores.

We use about 50 a week and maybe I've broken the head off of 3 of them in the past 4 months. Honestly, that's most likely only because my guy was using too much tork with my impact driver. Going full throttle while the thing is already set. Yea, they might break then. If you know how to use a drill. You shouldn't have an issue. These are good screws. Much better than buying 15 for the same damn price at my local hardware store.

First off, if you are trying to drill into concrete or brick you need a masonry drill bit and a hammer drill. Otherwise, you will spend long hours trying to drill a short hole. I had been drilling holes for plastic wall anchors into concrete but they could pull out fairly easily. So, I decided to try these screws that directly screw into the concrete. They even come with their own masonry drill bit. Let's just say that I will be using these from now on. I needed to mount a steel wall rack for storage bins onto a concrete wall. To be honest, I was kind of dreading this project because it was going to take a chunk of my Saturday. The drill went through the concrete like butter and the screws screwed tightly into the wall. The whole mounting project probably took 5 minutes.