Dell PowerEdge R220 - 9 Rack Rails and Cable Management; Figure 6. R220 Static Rails; Figure 7. R220 Mounted in a 4-Post Square Hole Rack

Dell PowerEdge R220 Technical Guide 26
9 Rack rails and cable management
ReadyRails™ static rail system provides tool-less tool-less mounting in 19”-wide, EIA-310-E
compliant square hole and unthreaded round hole racks via the ReadyRails mounting interface. The
rails also offer tooled mounting support for 4-post threaded and 2-post (Telco) racks for added
versatility.
Figure 6. R220 static rails
ReadyRails for the R220 are designed so that the inner chassis must first be attached to the sides of
the system and then inserted into the outer cabinet in the rack.
Figure 7. R220 mounted in a 4-post square hole rack