Raumer Rainox striker
Raumer Rainox Striker.
Use with the Rainox anchor (article Rm130).
When the hole is drilled, screw this small steel item into the anchor, place the anchor in the hole, and then the Striker forms the striking surface. Hit it squarely with your hammer (as with all the spits you've ever placed)and this will expand the cone in the end, and fix the anchor in place. Remove Striker, screw in bolt with hanger, off you go.
NOTE: buy at least two if your rigging relies on this - and check that the threads are protected in transit.