Cisco Catalyst 250 Series Getting Started Manual page 19

Mounting in a Rack
Procedure
Step 1 Use the four supplied Phillips machine screws to attach the brackets to the rack.
Step 2 Use the black Phillips machine screw to attach the cable guide to the left or right bracket.
1 Cable guide
2 Phillips machine screw, black (48-0654-01)
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4 Number-12 Phillips pan-head screws (48-0523-01) or
Number-10 Phillips pan-head screws (48-0627-01)
5 Mid-mounting position