tl;dr: Suitable for aluminum but not for ferrous metals. Simply drill a test hole in 1/8 inch thick aluminum plate with a #10-32 drill/tap. The thread came out fine, so I set about the main task: drilling and tapping an identical hole in a stainless steel (304) plate. I used a titanium coated step drill bit and Tap Magic to drill the hole and started cutting it with a battery powered hand drill. However, this was beyond the capabilities of this small crane, as it soon cracked and shattered into pieces of metal.
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