Acer AR180 F1 - Manual (Page 141)

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