I got this right angle attachment for my drill. On it's hex key, there is a steel ball. What is it's purpose? As I can't find a hex bit that has a hole for this ball to lock into -- though I can find the opposite, a bit with a ball. Never mind that it's located on the edge of the hex, rather than on the flat end.

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1 Answer 1


That ball fits into a groove that is on most bits - hex or flat or posidrive so they don't fall out.

If the bits don't have a groove then it is the spring force / friction that stops the bit from falling out.

  • So by that it means that it should retract inwards somewhat when you're inserting the hex bit, and push back to the grove, so it holds it in place?
    – Dehbop
    Commented Jul 22, 2017 at 12:18
  • Or would you say no to that?
    – Dehbop
    Commented Jul 22, 2017 at 12:21
  • You have it right @Dehbop
    – GdD
    Commented Jul 22, 2017 at 12:33

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