In article , Trevor Jones wrote:

Sounds to me like it's time to find a magnetic base drill. Try a tool
rental outfit. Try calling any local contracters that deal in steel
construction.

A normal mag-base drill like a Rotabroach won't go much over 2".

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Mike Graham | Metalworker, rustic, part-time zealot.
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http://www.metalmangler.com| Caledon, Ontario, Canada