Acer AR160 F1 - Manual (Page 127)

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3 Attach the inner rails to both sides of the server.
a Align the holes on the left and right front inner rails (1) to the
hooks on the left and right sides of the server.
b Slide the rails to the front until the rails lock into place with an
audible click.
4 Attach the rear inner rails to both sides of the server.
a Align the holes on the left and right rear inner rails (2) to the
hooks on the left and right sides of the server.
b Secure the chassis with six screws (3) as illustrated.
5 Install the mounting rails to the rack posts.
a Align and insert the tabs on the left and right mounting rails
to the front rack post mounting holes (1). Make certain the
proper mounting holes on rack post are selected.