Dell VersaRails Guide D'installation page 31

Figure 1-18. Installing the Slide Assemblies for Flush-Mount Configuration
12-24 x 0.5-inch pan-head Phillips
screw (8 per slide assembly)
system locking mechanism
10
Use an 11/32-inch wrench or nut driver to fully tighten the nuts on the mounting brackets
on both slide assemblies that you tightened with your fingers.
11
Install the stiffening bracket between the back ends of the slide assemblies and secure
the bracket with a 12-24 0.5-inch pan-head Phillips screw on each slide assembly
(see Figure 1-18).
stiffening bracket
slide assembly
Rack Installation Guide
1-29