Acer Altos G530 - Manual (Page 171)

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(2) Tighten the four thumbscrews on the rear of the mounting
shelf (2).
5 Install the rack brackets to the rack by following the steps below:
(1) Align the rack brackets to the mounting rail until the six screw
holes become visible.
(2) Secure the rack brackets to the mounting rails using six M4 x
L8 metal screws and nuts (see page 157).
Tighten the screws but leave them loose enough to allow
length adjustment when installing the mounting rails to the
rack.
(3) Attach the other rack brackets to the remaining mounting rail.