How to change the drill bit f drill machine to make a hole in iron bolt

How to change the drill bit f drill machine to make a hole in iron bolt
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@enzoburra4977 says:

Per cambiare le punte oggi ci vuole la laurea!

@jafarayar3845 says:

Don't put the weak point of drill bit in the chuck that can easily broken

@Rose-Kre8Tv says:

Nice and simple, thank you!

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