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

The stone sidewalk I was going under was a little more challenging than anticipated, kept running into a rock or mortar that was deeper than expected. But no problems, the tip didn't snap off when it ran into something that wouldn't budge. Adjusted the attack angle and finally broke through, worked out great.

It’s suitable for drilling the desired holes in wooden posts.

Worked well for me. Easy to flex with right tools and dug right it when it hit wood.

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.

I bought this bit just in case for the project of wiring my home for cameras, doorbells and other iOT devices. Turned out I needed this for the first cable I ran, and it came through like a champ.

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.

Did the job I bought it for and at a good price. The biggest issue is that it went dull very quickly. After going though the first 4 jousts like butter it quickly turned into a struggle to get it though the remaining 8. I can resharpen but it looks like the metal used is very soft and it will be a battle to keep this in good working order. If I had to do it again I think I would pay a few more $$ and get a brand named one.

Good product highly recommend