Dell VersaRails Guide D'installation page 13

2
Place a mark 88 mm (3.5 inches) above the original mark you made (or count up six holes in
a rack that meets EIA-310 standards) and mark the rack's front vertical rails with a felt-tipped
pen or masking tape (if you counted holes, place a mark just above the top hole). This mark or
piece of tape indicates where the system's upper edge will be located on the vertical rails
(see Figure 1-4).
Figure 1-4. Marking the Vertical Rails
tape on vertical rail
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Rack Installation Guide