We call them Nelson studs where I live. They're good for putting down q-deck. I've used powder actuated tools that drive studs into steel beams (Hilti DX) in the past with good success as well. If I were planning out another industrial building with a metal roof I'd probably go with the Hilti DX, but both are good systems. It's faster and sometimes you can get away with not having to get a fire permit and having fire watch on site (but that depends on the client).

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