My impact driver is probably my most used tool for home DIY tasks. I have a corresponding set of bits that are very useful. Two of them, however, are a bit confusing to me:

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They are double sided. If I place one end in the bit holder as shown in the bottom photo, it's very wobbly. How are these meant to be used?


  • Notice how all three of those bits have the same back end? That depression is designed to fit the tool's retainer. They're not intended to be stacked.
    – isherwood
    Dec 7, 2021 at 20:38

1 Answer 1


Very simple: Don't put them in the bit holder.

The bit holder has two uses:

  • Allow use of short bits

    The double-ended bits are long enough that they don't need a holder.

  • Allow easy change of bits

    The double-ended bits each give you two bits in one. Loosen, flip, tighten.

You should make sure the bits are designed for impact drivers - some are, some are designed only for use in ordinary drill/drivers.

  • 3
    Regarding the second part of what you said, I'm almost certain it's fine to use these in the impact mode (I don't think my impact driver has a non-impact mode). They came in a set clearly labelled "impact duty". Similar: homedepot.com/p/…
    – Dan
    Dec 6, 2021 at 23:39
  • I've never seen an "impact driver" that didn't have a non-impact mode. Using ordinary screwdriver bits in impact mode, even if technically OK, will wear them out faster and mess up the stuff you're working on too. Take a look on your tool for a switch (other than the power and forward/reverse switches). Dec 6, 2021 at 23:42
  • There's the forward/reverse/neither switch. 1,2,3 buttons for torque limiting and a special mode for driving self-drilling screws. Makes sense about not using regular bits in impact mode. As mentioned above, I think these ARE impact bits.
    – Dan
    Dec 6, 2021 at 23:44
  • 1
    I have worked the heck out of a double ended bit with an impact driver. A #3 phillips bit. driving self drilling tapping 14ga screws through 3/4" plywood into 14ga metal by the hundreds. They really last, at least the brand I had They are not meant to be used with a bit holder....
    – Jack
    Dec 7, 2021 at 5:48

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