2 wedge anchor M10 with ring nut

Ring nut: Din 582, C15E steel, galvanized
Anchor bolts 90 mm long
For a 10 mm dust-free hole.

A suitable hole is drilled into the concrete. You put the anchor into the hole and it must sit very close.
The washer gives the conclusion to the ceiling.
The nut is tightened with a torque and gets the anchor into the spread.
Then the ring nut has to be screwed on it as a lock nut.