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.

Great quality. No breaks so far

This is a good masonary screw. It works pretty well if you pre-drill the whole. The only negative I have is they break easily if over torqued. So, be careful when tightening!

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.

Thay worth the money great product.

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.

The anchors are high quality. I just used about 50 of them securing walls to concrete floor. Concrete is 3000 psi and not a single head broke off. Half price of national brand. Thank you

Had 17 to drop into 6 total 16x16x4 precast cement blocks. Didn't use the bit that came with the screws because I have an SDS hammer Drill. Using a 3/16 x 6" bit that I marked at 3.5" pre-drilled the holes to 3.5" ea. of the 17 screws dropped into the 4" blocks, 3 of screws heads snapped off long before the screw could have bottomed out. Ended up having to drill 6 more holes as I had to move 3 of the 2 hole brackets in order to ensure the fencing structure was properly anchored. Compared to Tapcon, they are slightly less expensive for a similar quantity in my experience, but also slightly less durable. Perhaps quality control is less stringent, so If you hate having additional unwanted holes in your work projects, you should probably consider another brand. If the holes won't be visible and you can afford some errors, then these will work just fine.