The rackmount kit contains two slide-rails, two mounting brackets, and optional securing screws.
Note - Refer to the rackmount kit installation card for simplified instructions about installing your server into a four-post rack, using the slide-rail and cable management arm options.
Figure 5 Tool-less Rackmount Kit Contents
2 Mounting brackets
3 Four M4 x 5 fine-pitch mounting bracket securing screws (not used)
4 Installation card