Lowe's calls them masonry drive pins. As the pin is hammered in the built in shield flares out, it's super strong but be aware that if you ever have to remove them it will destroy the sheet metal or whatever substrate you have used. I have used them for years for MDO and metal sign installations, but have recently gone to Tapcom fasteners.
It seemed more customers were wanting to relocate a sign and I got tired of trying to remove the sign without damaging it.
Lag bolts and shields would also work. Make a template out of 4mm corrugated plastic, predrill your holes at your shop, duct tape the template to the wall, drill your holes, install the shields and git 'er done. This way will save you time in the long run.