On 2017-07-21, Ignoramus2777 wrote:

Can these drills drill metal?

You've got enough of them so try it! Go for high RPM while you
are about it. And particularly -- avoid side stress on them, as that is
quite likely to snap the drill -- the same with the standard shanked
solid carbide drills which I used for PCBs back when. The smaller the
diameter, the easier it is to snap the drill with just a little side
force.

When drilling out the broken tap, the main trick was to get the
workpiece solidly clamped to the table of the tiny drill press.

Also -- check for runout in the drill chuck.

Enjoy,
DoN.

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