Acer AT350 F1 - Manual (Page 145)

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3 Attach the inner rails to both sides of the server.
(1) Align the screw holes on the rack handles with those on the
server and use the screws from the rack mount kit to secure
the rack handles to the server.
(2) Align the screw holes on the left and right front inner rails
and use the screws from the rack mount kit to secure both
rails to the server.