ERICO used to push these.
They are now prohibited by the NEC.
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You have to use your own #12 drop wires -- in my area these are spray painted green or red to mark them as EC provided.
Then you can use
kx (MC)
k-8 (1/2)
k-12 (3/4)
k-16 (1)
sometimes referred to as 'batwings.'
1/4 smooth drop rods are available from Hilti and others.
These can be shot into overhead concrete and steel.
They don't require tying off to the grid. They make the most sense in new TIs. One can run EMT above the lid and not revisit the work to tie it off -- something required if you use #12 ceiling drop wire.
