Merlin 3070 Service And Maintenance Manual page 218

c. If you are mounting the standards on a masonry wall, use the ¼"
masonry drill bit provided with the kit to drill all eight holes 1½" deep.
Insert one of the plastic anchor plugs into each of the holes and tap
them lightly with a hammer until the flange at the end of the plug is
flush with the surface of the wall. Align the slats and standards and
secure them with the screws (Figure 4).
Standard
Mounting the Standards on a Masonry Wall
Slat
Figure 4.
Masonry
Wall
Anchor
Plug