Dell PowerEdge 850 Guide D'installation page 18

Figure 1-8. Installing the System in the Rack
mounting rails (2)
system rails (2)
back release latches (2)
thumbscrews (2)
2 Working from right to left, position the chassis on the mounting rails and slide back
(see Figure 1-8).
3 Push the chassis back into the mounting rails until the system stops (see Figure 1-8).
4 Secure both thumbscrews on the front panel of the chassis.
NOTE:
Figure 1-8 applies to the RapidRails, VersaRails, and two-post rack kits.
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Rack Installation Guide