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Can anyone tell me how is the accessory in the picture called and what's its purpose?

drill accessory http://storage9.static.itmages.com/i/17/0228/h_1488307031_8180005_c15fb41395.png

Thanks

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  • I believe it's a drywall ratchet. If set properly, it will slip just when the drywall screw is flush with the surface, stopping you from going deeper.
    – Chris Cudmore
    Feb 28, 2017 at 18:50
  • Thanks. I seem to see them quite often in DIY videos and it's not always about drywalls. e.g. storage2.static.itmages.com/i/17/0228/…
    – Luc
    Feb 28, 2017 at 19:21
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    It really just looks like a magnetic bit holder that allows a little flexion.
    – Hari
    Feb 28, 2017 at 19:27
  • All the drywall type adapters I have for screw guns have a ridge to dimple the paper/ push the bit out. Those work well when I don't have my drywall drill. I would think @Hari Ganti has a better guess.
    – Ed Beal
    Feb 28, 2017 at 19:44

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I'm fairly sure this is a bit holder made by a company called Wera: Rapidaptor Bit Holders

I think it's 897/4 R Rapidaptor BiTorsion universal bit holder on that page.

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