Eagle Tool US ESP75054 Flex Shank Installer Drill Bit, Screw Point, 3/4-Inch by 54-Inch, 1/4-Inch Shank,Made in The USA

I have abused it repeatedly and it hasn't broken, unlike my Klein flex bit which broke after a few holes.

Application of this item is to drill up through a fire break inside the wall, then fish a 14/2 Romex cable up 7 feet to install in-wall speakers. After using a stud finder and ball magnet to locate the studs and drywall nails (added touch), I then removed the electrical outlet and drilled two 9/16 in holes on the side of the electrical outlet housing. These were my entry points for both the 54" 9/16 flex bit and my Rigid inspection camera to see what I was drilling into behind the wall. I was a little nervous applying force to get the bit to bend. Eventually, I gain more confidence and was able to apply pretty good flex and got it to drill upward into the fire block. I did run into an issue with the insulation. The bit got tied up a bit, when I was drilling - twisting insulation around it. No problem though. Just removed some of it at the top where my speaker cut-out is and replaced some insulation later. On the second speaker, I ended snapping the bit! Yes, as the disclaimer states, there is a breaking point. Well I know that is now:-) It was a lot of force and a very aggressive bend that caused it. I ordered another one today to complete the work. Luckily the bit broke with about two feet of it outside the outlet. I'll be able to remove it and start over with the replacement.

Awesome bit, cut like butter, I gave her hell and she did not break!!

Start your drill slow, there's very little flex in these but they do work. On the whole 4 stars but 3.5 would be more accurate.

This drill accessory worked out really well for me. I noticed a lot of the bad reviews for this product seemed to come from people who did not follow the instructions or are using it for the wrong job. This bit is meant to drill through wood. If you go slow and remember to back out the bit halfway through the wood it works great. I used this to run wire in an old house through fire blocks in the ceiling to a ceiling fan. It was true 2x4 dimensional lumber from real American old growth trees. I fed the bit through a hole I made in a closet to where the fire block was along the joists. I made sure the bit was pointed through the fire block and not pointing up into the second floor. I started slow on the drill until I could feel it bite then gave it more RPM's. When it felt like I was in a ways I stopped and reversed the drill until it was spinning free then reversed the drill again and it punched through with a perfect hole. I did not need to apply a lot of pressure to the drill and the bit came out just fine. I used it three more times to run wire in other locations and it's still going strong.

The build quality is good, but the bit has a design issue. The shaft is round so the bit slips in the drill chuck. The shaft is flexible to allow good reach when drilling.

This worked really well for install an outside receptacle that had to go down at a 27.5 degree angle through a facade using over 30” of this bit to do it and it performed as expected.

I purchased the 54" and 72" versions of this product, as well as their 36" and 54" extensions. All of their products were useless to me and I ended up losing their 54" and 72" flex-bit and 36" extension in my walls. The flex-bits are not flexible other than near the half-way point of the shaft. Any attempt to bend them shorter than the half-way point is futile and dangerous because of the amount of force applied, the reliability of the anchor point, and the potential damage it could cause to the surface its being bent around. For my own cable pull project from the attic to the 1st floor (in a 2 story home), my job was cut short when I couldn't even use the 54" or the 72" flex-bit to drill through the top plate (2 studs stacked) because the drill tip was weak. I had to use a spade bit to go through the top plate first then use their products. Even when using a hammer drill, in low torque setting, I had difficulty drilling 2 holes along the way. I ended up losing the extensions and drill bits in my walls because of thermal expansion caused by the heating of the extensions (see my review for this issue). I strongly recommend purchasing flex-bits from a different company not just from my own experience, but take a look on YouTube for their videos on how they use their flex-bits to drill holes and pull cable. Their "stage" is a mock-up of what NOT to do when doing a cable-pull job and they even contradict what they say in their video and what is adorned via stickers on their products (e.g., "do NOT drill blind"). The video shows their employees using very flexible (rubbish) extensions and drill bits going from the bottom to the top, cutting through wood like cheese and going blindly along the side of the walls. Doing it this way and not drilling closer to the center of the stud could cause several issues (e.g., hitting nails or other cables, conduits, pipes, etc) and it makes me question why a vendor would even post this on their channel. These drill bits will not eat through nails, will barely go through wood, and are not flexible enough. You have been warned.