Dell PowerEdge C2100 - Manual (Page 6)

4
Getting Started With Your System
1 Secure the rails to the front of the rack using two screws and to the back of
the rack using four screws.
2 Align the keyhole slot on the chassis rails with the corresponding pin
on either side of the system and slide the chassis rails towards the front
of the system until it locks into place. Secure the chassis rails to the
system using screws.