Matty F wrote:

Apparently it's a bit dangerous if the power fails while it's
drilling, because the magnet unclamps while the drill is still turning.

Since these tend to be used where reasonable sized holes are needed, the
rotation speed is unlikely to be that high...

I would expect there is more danger from the thing falling off and
landing on you without worrying about the spinning bits!

--
Cheers,

John.

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