Cisco Catalyst 250 Series Getting Started Manual page 17

Attaching the Rack-Mount Brackets for the Catalyst 2960-X Switches
Procedure
Use two Phillips flat-head screws to attach the long side of the bracket to each side of the switch.
Figure 4: Attaching Brackets for 19-inch Racks
1 Front-mounting position
2 Number-8 Phillips flat-head screws (48-2927-01)
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3 Mid-mounting position
4 Rear-mounting position