HP Surestore Tape Library Model 2/20 User Manual page 30

Figure 12
(larger trim brackets)
28 Installing the 2/20, 4/40 & 6/60 Series Libraries into a Rack
Trim Brackets (4/40 Series)
The rack kit includes extra trim brackets. The smaller flush-mount
Note
trim brackets are used with flush-mount racks. The larger trim
brackets are typically used with older HP racks that have a
55mm bezel depth.
(flush-mount trim brackets)
Chapter 1