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Old 03-31-2019, 11:17 AM   #8
Zombie Panda
Scooby Specialist
Member#: 425346
Join Date: Jul 2015
Chapter/Region: South East

You can anneal the area first with a torch. Then use tungsten carbide bit. You may get by with cobalt (not Kobalt-Lowe's brand). HSS or titanium coated will not drill hardened steel.
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