Asus RS300-E7/RS4 - Manual (Page 41)

3-3 ASUS RS300-E7/RS4
2. Select a 1U space on the rack
where you want to install the rack
rail. A 1U space consists of three
square mounting holes with two
thin lips on the top and the bottom,
as shown in the right figure.
3. Adjust the rack rail to fit the depth
of the rack.
5. Secure the front and rear ends of the
rail with two rack screws and washers.
6. Repeat step 3 to 5 to attach the rack rail
on the other side of the rack.
4. From inside the rack, place the rear rail
hook on the bottom thin lip of the rear
mounting hole, and then place the front
rail hook on the bottom thin lip of the
front mounting hole, as shown in the
right figure.