Allied Telesis x310 Series - Manual (Page 70)

Chapter 4: Installing the Switch on a Wall
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5. Have another person hold the switch on the concrete wall at the
selected location for the device while you use a pencil or pen to mark
the wall with the locations of the two screw holes in the brackets. Refer
to Figure 27. Be sure that the selected location adheres to the
recommendations in “Recommended Minimum Wall Area Dimensions”
on page 66.
Figure 27. Marking the Locations of the Bracket Holes on a Concrete Wall
6. Place the switch on a table or desk.
7. Use a drill and a 1/4” carbide drill bit to pre-drill the two holes you
marked in step 5. Please review the following guidelines:
 Prior to drilling, set the drill to hammer and rotation mode. The
modes break up the concrete and clean out the hole.