Dell PowerEdge C6220 II Getting Started page 8

On each vertical rack flange on the back, put tw o s crew bases into
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the t wo square holes right above the rail. See F igure 3.
Inst all t he chass is stabilizer s hipping brackets (optional) on the back
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rack flanges.
Inst all and tight en the s crews.
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NOTE : To transport systems already installed in the rack, ensure that the two
chassis stabilizer shipping brackets (optional) are in place.
Figure 3. I ns talli ng the Chassis Sta bili zer Shi ppi ng Brackets
Getting Started With Your System | 6