Home Improvement Stack Exchange is a question and answer site for contractors and serious DIYers. Join them; it only takes a minute:

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

I just came across this bit in my toolbox, which I'm fairly sure came with an installers drill bit (54" long flexible bit, with a hole in the end for pulling wires back through).

mystery bit

It's a standard screw driver bit, tapered at the end (though not enough to actually be a flathead bit) and a hole through it. Any ideas what this is for?

share|improve this question
up vote 5 down vote accepted

I think it would be used for pulling or twisting something. For example, you would attach a wire to it, then engage the drill or manually rotate, thus twisting or rotating the wire. It would also be used for fishing the wire thought a wall. The rotation would allow it to more easily pass.

share|improve this answer

If you hadn't said it came with the installer's bit, I would have guessed it was for twisting safety wire:

Safety wire

I guess it's still possible, but it seems like an unlikely thing to include with an installer's bit.

share|improve this answer

Can't say for sure, but I would say it's for twisting pairs/groups of wires together.

share|improve this answer

Maybe you're meant to push something like a screwdriver through the hole, and then use that as a handle (lots of leverage). Of course this could damage your screwdriver if you weren't careful...

share|improve this answer

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.