Magnetized Drill bits

[pwdrive]

I have noticed that virtually all my drill bits have become magnetized, they have always got swarf etc attached to them. I haven't noticed this before when I used a hand (electric drill) it's only since having and using a vertical stand drill.
Any ideas why and how to demag them? I thought maybe an old electric shaver E core and bobbin.
Mike

All I can think of is pressure unless your set up is inducing a mag field.

Lawrence.