Hi gang,
Going through a box of stuff I won in a Gray's auction years ago. I had bid on a pallet load of gear because I wanted only 1 item... Pretty standard I would assume.... Anyways there was a box load of these and I just stashed them on the off chance I might need them one day.

At a guess I thought maybe some kind of countersink?
I did try to chamfer a drilled hole in a bit of hot rolled and a bit of mystery aluminium and the outcome was not good.
Hoping someone here can enlighten me/us.

As always,
Thanks in advance.
Matt

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