Ubiquiti Networks RocketDis LW - Manual (Page 9)

7. Attach two Hex Head Bolts, two Lock Washers, and two Flat
Washers to the bottom of the Mounting Bracket. Ensure that
there is a gap of 8 mm between each Flat Washer and the
Mounting Bracket.
Note: Ensure that each Lock Washer is always
installed between the Hex Head Bolt and Flat Washer.
Hex Head Bolt
Flat Washer
Lock Washer
8 mm