Middle Atlantic SH-BRK-3P The SH-BRK-3P Quick-Mount Shelf for BRK Series Racks (3 Pack) from Middle Atlantic is a rack shelf designed for use with BRK series laminate racks. This unit can be mounted in any BRK rack without the use of special mounting hardware. Cable-management slots on the shelves allow for better management of the cabling in your rack. This special pack of (3) rack shelves is ideal for contractors or others with growing or changing needs related to their BRK rack setup.