HP UPS R7000 Installation Instructions

4. Loosen the wing nuts or hex nuts, and then extend the brackets to
the appropriate length.
5. Insert screws through the rack into the mounting rail and the front
of each mounting bracket.
6. Install clip nuts into the rear of the rack.
7. Insert screws through the mounting rail into the clip nuts.
8. Install the rail reinforcement plates and tighten using hex nuts
with captive washers included in the kit, instead of the nuts
included with the rail.
9. Tighten the wing nuts or hex nuts.